CVE-2026-50219

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.

Security Fix(es):

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,(CVE-2026-50219)

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)

• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)

• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)

• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)
• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)
• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: libexpat: Use-after-free vulnerability due to improper handler call depth tracking (CVE-2026-50219)
• expat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow (CVE-2026-56132)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

• CVE-2026-50219: reject libexpat API re-entry from inside handler callbacks to prevent use-after-free
• CVE-2026-56131: extend the handler re-entrancy guard to XML_ResumeParser
• CVE-2026-56412: guard XML_TOK_DATA_CHARS handler calls in doCdataSection

• CVE-2026-50219: reject libexpat API re-entry from inside handler callbacks to prevent use-after-free
• CVE-2026-56131: extend the handler re-entrancy guard to XML_ResumeParser
• CVE-2026-56412: guard XML_TOK_DATA_CHARS handler calls in doCdataSection

• SECURITY UPDATE: Use-after-free because the application-supplied XML_Encoding.convert and XML_Encoding.release callbacks were left outside handler call depth tracking, so a same-parser call made from inside them freed state the running parse still owned (libexpat before 2.8.4)
  • debian/patches/CVE-2026-76957.patch: install the trampolines callUnknownEncodingConvert() and callUnknownEncodingRelease() in handleUnknownEncoding(), passing the parser itself to XmlInitUnknownEncoding() as the converter's user data, so the reentrancy counter is bumped around the application callbacks and the existing forbidden-call rejection rules apply to them too; routing release through the trampoline also clears m_unknownEncodingRelease/m_unknownEncodingData so it runs exactly once on every path; also carries upstream's regression test into tests/runtests.c (2.2.6 has neither tests/misc_tests.c nor tests/handlers.c, so the test brings a local equivalent of forbidden_calls_character_handler())
  • CVE-2026-76957
• SECURITY UPDATE: Use-after-free because handler call depth tracking was absent entirely, leaving XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, XML_ParserReset and XML_ResumeParser callable from inside a handler, and the XML_TOK_DATA_CHARS handler calls in doCdataSection() untracked (libexpat before 2.8.2)
  • debian/patches/CVE-2026-56131.patch: introduce m_handlerCallDepth with beforeHandler()/afterHandler() around every handler invocation and isCalledFromInsideHandler() guards on the six affected entry points; this is the prerequisite the CVE-2026-76957 fix builds on, and it is the same 33-commit backport already shipped for expat 2.2.5 on ubuntu18.04els, regenerated against 2.2.6
  • CVE-2026-56131
  • CVE-2026-50219
  • CVE-2026-56412

• CVE-2026-56131: fix a use-after-free by refusing re-entrant XML_ResumeParser calls issued from inside handler callbacks; carries the prerequisite handler call-depth tracking, which also covers CVE-2026-50219 and CVE-2026-56412

• CVE-2026-56131: fix a use-after-free by refusing re-entrant XML_ResumeParser calls issued from inside handler callbacks; carries the prerequisite handler call-depth tracking, which also covers CVE-2026-50219 and CVE-2026-56412

• CVE-2026-56131: fix a use-after-free by refusing re-entrant XML_ResumeParser calls issued from inside handler callbacks; carries the prerequisite handler call-depth tracking, which also covers CVE-2026-50219 and CVE-2026-56412

Missing control flow integrity checks. (CVE-2026-50219) Missing control flow integrity checks. (CVE-2026-56131) Out-of-bounds write. (CVE-2026-56132) Integer overflow. (CVE-2026-56403) Integer overflow. (CVE-2026-56404) Integer overflow. (CVE-2026-56405) Integer overflow. (CVE-2026-56406) Integer overflow. (CVE-2026-56407) Integer overflow. (CVE-2026-56408) Integer overflow. (CVE-2026-56409) Integer overflow. (CVE-2026-56410) Integer overflow. (CVE-2026-56411) Missing control flow integrity checks. (CVE-2026-56412)

These are all security issues fixed in the expat-2.8.2-1.1 package on the GA media of openSUSE Tumbleweed.

This update for expat fixes the following issues:

• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based buffer overflows (bsc#1268573).
• CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential arbitrary code execution (bsc#1275096).
• CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and arbitrary code execution (bsc#1275096).
• CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and application crashes (bsc#1275096).
• CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer corruption and arbitrary file write conditions (bsc#1275096).
• CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory corruption, information disclosure, and potential code execution (bsc#1275096).
• CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free conditions and arbitrary code execution (bsc#1275096).
• CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c (bsc#1275732).
• CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted X (bsc#1275860).
• CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. (bsc#1275859).

Changes for expat:

• Updated to version 2.8.4

This update for MozillaFirefox fixes the following issues: Firefox Extended Support Release 153.5.0 ESR (MFSA 2026-108, bsc#1284493):

• CVE-2026-109704: Privilege escalation in the Application Update component.
• CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component.
• CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
• CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
• CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
• CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing component.
• CVE-2026-109710: Use-after-free in the Graphics: Text component.
• CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
• CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
• CVE-2026-109713: Use-after-free in the Crash Reporting component.
• CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
• CVE-2026-109718: Use-after-free in the XML component.
• CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
• CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
• CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
• CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
• CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109726: Use-after-free in the SVG component.
• CVE-2026-109727: Use-after-free in the Audio/Video component.
• CVE-2026-109728: Use-after-free in the DOM: Animation component.
• CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
• CVE-2026-109730: Integer overflow in the Graphics component.
• CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
• CVE-2026-109732: Use-after-free in the DOM: Streams component.
• CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109734: Mitigation bypass in the DOM: Security component.
• CVE-2026-109736: Frame poisoning in the Layout component.
• CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
• CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
• CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
• CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
• CVE-2026-109742: Information disclosure in the PDF Viewer component.
• CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
• CVE-2026-109744: Other issue in the DOM: File component.
• CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
• CVE-2026-109751: Information disclosure in the Networking component.
• CVE-2026-109752: Use-after-free in the DOM: Workers component.
• CVE-2026-109753: Incorrect boundary conditions in the Layout component.
• CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
• CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
• CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
• CVE-2026-109759: Site isolation issue in the Networking component.
• CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
• CVE-2026-109762: Incorrect boundary conditions in the SVG component.
• CVE-2026-109763: Mitigation bypass in the File Handling component.
• CVE-2026-109764: Mitigation bypass in the Enterprise Policies component. -…

Root has patched CVE-2026-50219 in the expat package for Root:Debian:11. Multiple fixed versions available.

Root has patched CVE-2026-50219 in the expat package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-50219 in the expat package for Root:Debian:13. Multiple fixed versions available.

This update for expat fixes the following issues:

• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based buffer overflows (bsc#1268573).
• CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential arbitrary code execution (bsc#1275096).
• CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and arbitrary code execution (bsc#1275096).
• CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and application crashes (bsc#1275096).
• CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer corruption and arbitrary file write conditions (bsc#1275096).
• CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory corruption, information disclosure, and potential code execution (bsc#1275096).
• CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free conditions and arbitrary code execution (bsc#1275096).
• CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c (bsc#1275732).
• CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted X (bsc#1275860).
• CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. (bsc#1275859).

Changes for expat:

• Updated to version 2.8.4

This update for expat fixes the following issues:

• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: mishandled memory reallocation during array scaffolding in doProlog can cause heap-based buffer overflows (bsc#1268573).
• CVE-2026-56403: integer overflow in the storeAtts function can cause memory corruption and potential arbitrary code execution (bsc#1275096).
• CVE-2026-56404: integer overflow in the addBinding function can cause undersized memory allocations, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56405: integer overflow in the getAttributeId function can cause heap memory corruption and arbitrary code execution (bsc#1275096).
• CVE-2026-56406: missing bounds validation in XML_ParseBuffer can cause integer overflows, memory corruption, and application crashes (bsc#1275096).
• CVE-2026-56407: integer overflow in doProlog related to entity text length can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56408: integer overflow in the copyString function can cause heap memory corruption and application crashes (bsc#1275096).
• CVE-2026-56409: integer overflow in the xmlwf utility output filename handling can allow path buffer corruption and arbitrary file write conditions (bsc#1275096).
• CVE-2026-56410: integer overflow in resolveSystemId within the xmlwf utility can cause memory corruption, information disclosure, and potential code execution (bsc#1275096).
• CVE-2026-56411: integer overflow in endDoctypeDecl via NOTATION declarations in xmlwf can cause memory corruption and denial of service (bsc#1275096).
• CVE-2026-56412: incomplete handler call depth tracking in doCdataSection can cause use-after-free conditions and arbitrary code execution (bsc#1275096).
• CVE-2026-66046: libexpat: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c (bsc#1275732).
• CVE-2026-72522: libexpat: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted X (bsc#1275860).
• CVE-2026-76957: libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. (bsc#1275859).

Changes for expat:

• Updated to version 2.8.4

This update for MozillaFirefox fixes the following issues: Firefox Extended Support Release 153.5.0 ESR (MFSA 2026-108, bsc#1284493):

• CVE-2026-109704: Privilege escalation in the Application Update component.
• CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component.
• CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
• CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
• CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
• CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing component.
• CVE-2026-109710: Use-after-free in the Graphics: Text component.
• CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
• CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
• CVE-2026-109713: Use-after-free in the Crash Reporting component.
• CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
• CVE-2026-109718: Use-after-free in the XML component.
• CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
• CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
• CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
• CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
• CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109726: Use-after-free in the SVG component.
• CVE-2026-109727: Use-after-free in the Audio/Video component.
• CVE-2026-109728: Use-after-free in the DOM: Animation component.
• CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
• CVE-2026-109730: Integer overflow in the Graphics component.
• CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
• CVE-2026-109732: Use-after-free in the DOM: Streams component.
• CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109734: Mitigation bypass in the DOM: Security component.
• CVE-2026-109736: Frame poisoning in the Layout component.
• CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
• CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
• CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
• CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
• CVE-2026-109742: Information disclosure in the PDF Viewer component.
• CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
• CVE-2026-109744: Other issue in the DOM: File component.
• CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
• CVE-2026-109751: Information disclosure in the Networking component.
• CVE-2026-109752: Use-after-free in the DOM: Workers component.
• CVE-2026-109753: Incorrect boundary conditions in the Layout component.
• CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
• CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
• CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
• CVE-2026-109759: Site isolation issue in the Networking component.
• CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
• CVE-2026-109762: Incorrect boundary conditions in the SVG component.
• CVE-2026-109763: Mitigation bypass in the File Handling component.
• CVE-2026-109764: Mitigation bypass in the Enterprise Policies component. -…

This update for expat fixes the following issues:

• CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents (bsc#1249584).
• CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to copy the encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser (bsc#1257144).
• CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
• CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an entity declaration value (bsc#1259726).
• CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
• CVE-2026-32778: NULL pointer dereference in setContext on retry after an out-of-memory condition (bsc#1259729).
• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
• CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406, CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410, CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
• CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function (bsc#1275732).
• CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
• CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use- after-free can occur (bsc#1275859).
• CVE-2026-77214: out-of-bounds read due to insufficient checks in XML_ParseBuffer() (bsc#1284334).
• CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input (bsc#1282347).
• CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

Update to 2.8.5 (jsc#PED-16154):

• Bug fixes:
• Fix an OOM-related memory leak on a failed overflow check
• Fix memory alignment for architectures with 128bit pointers
• Mark XML_SetHashSalt deprecated
• CMake: only add /source-charset:utf-8 when /utf-8 is not present
• lib: resolve undefined behavior from overshifting a signed int
• lib: support read-only hash table lookup with non-zero-terminated keys
• lib: use a C99 bool for ENTITY.open
• version info bumped from 13:3:12 to 13:4:12
• fix support for 2+ GiB documents (regression from 2.8.2)
• reject empty version in the XML declaration
• fix printf format for AIX
• CMake|AIX: enable EXPAT_DEV_URANDOM by default
• version info bumped from 13:2:12 to 13:3:12
• Existing API function XML_SetHashSalt is now deprecated
• because of its limitations, and its use should be
• considered a vulnerability. Please either use the new API
• function XML_SetHashSalt16Bytes (with known-high-quality
• entropy input only!) instead, or leave the derivation of
• a 16-bytes hash salt from high quality entropy to Expat's
• internal machinery (by not calling either of the two
• XML_SetHashSalt* functions).
• xmlwf: Fix a memory leak
• WASI: Fix format specifiers for 32bit WASI SDK
• Fix alignment of internal allocations for some non-amd64 architectures (e.g. sparc32); fixes up on the fix to CVE-2025-59375 (of Expat 2.7.2)
• Fix a class of…

This update for expat fixes the following issues:

• CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents (bsc#1249584).
• CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to copy the encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser (bsc#1257144).
• CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
• CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an entity declaration value (bsc#1259726).
• CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
• CVE-2026-32778: NULL pointer dereference in setContext on retry after an out-of-memory condition (bsc#1259729).
• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
• CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406, CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410, CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
• CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function (bsc#1275732).
• CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
• CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use- after-free can occur (bsc#1275859).
• CVE-2026-77214: out-of-bounds read due to insufficient checks in XML_ParseBuffer() (bsc#1284334).
• CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input (bsc#1282347).
• CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

Changes for expat:

Update to 2.8.5 (jsc#PED-16154):

• Bug fixes:
• Fix an OOM-related memory leak on a failed overflow check
• Fix memory alignment for architectures with 128bit pointers
• Mark XML_SetHashSalt deprecated
• CMake: only add /source-charset:utf-8 when /utf-8 is not present
• lib: resolve undefined behavior from overshifting a signed int
• lib: support read-only hash table lookup with non-zero-terminated keys
• lib: use a C99 bool for ENTITY.open
• version info bumped from 13:3:12 to 13:4:12
• fix support for 2+ GiB documents (regression from 2.8.2)
• reject empty version in the XML declaration
• fix printf format for AIX
• CMake|AIX: enable EXPAT_DEV_URANDOM by default
• version info bumped from 13:2:12 to 13:3:12
• Existing API function XML_SetHashSalt is now deprecated
• because of its limitations, and its use should be
• considered a vulnerability. Please either use the new API
• function XML_SetHashSalt16Bytes (with known-high-quality
• entropy input only!) instead, or leave the derivation of
• a 16-bytes hash salt from high quality entropy to Expat's
• internal machinery (by not calling either of the two
• XML_SetHashSalt* functions).
• xmlwf: Fix a memory leak
• WASI: Fix format specifiers for 32bit WASI SDK
• Fix alignment of internal allocations for some non-amd64 architectures (e.g. sparc32); fixes up on the fix to CVE-2025-59375 (of Expat 2.7.2) …

This update for expat fixes the following issues:

• CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents (bsc#1249584).
• CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to copy the encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser (bsc#1257144).
• CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
• CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an entity declaration value (bsc#1259726).
• CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
• CVE-2026-32778: NULL pointer dereference in setContext on retry after an out-of-memory condition (bsc#1259729).
• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
• CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406, CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410, CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
• CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function (bsc#1275732).
• CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
• CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use- after-free can occur (bsc#1275859).
• CVE-2026-77214: out-of-bounds read due to insufficient checks in XML_ParseBuffer() (bsc#1284334).
• CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input (bsc#1282347).
• CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

Update to 2.8.5 (jsc#PED-16154):

• Bug fixes:
• Fix an OOM-related memory leak on a failed overflow check
• Fix memory alignment for architectures with 128bit pointers
• Mark XML_SetHashSalt deprecated
• CMake: only add /source-charset:utf-8 when /utf-8 is not present
• lib: resolve undefined behavior from overshifting a signed int
• lib: support read-only hash table lookup with non-zero-terminated keys
• lib: use a C99 bool for ENTITY.open
• version info bumped from 13:3:12 to 13:4:12
• fix support for 2+ GiB documents (regression from 2.8.2)
• reject empty version in the XML declaration
• fix printf format for AIX
• CMake|AIX: enable EXPAT_DEV_URANDOM by default
• version info bumped from 13:2:12 to 13:3:12
• Existing API function XML_SetHashSalt is now deprecated
• because of its limitations, and its use should be
• considered a vulnerability. Please either use the new API
• function XML_SetHashSalt16Bytes (with known-high-quality
• entropy input only!) instead, or leave the derivation of
• a 16-bytes hash salt from high quality entropy to Expat's
• internal machinery (by not calling either of the two
• XML_SetHashSalt* functions).
• xmlwf: Fix a memory leak
• WASI: Fix format specifiers for 32bit WASI SDK
• Fix alignment of internal allocations for some non-amd64 architectures (e.g. sparc32); fixes up on the fix to CVE-2025-59375 (of Expat 2.7.2)
• Fix a class of…

This update for expat fixes the following issues:

• CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents (bsc#1249584).
• CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to copy the encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser (bsc#1257144).
• CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
• CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an entity declaration value (bsc#1259726).
• CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
• CVE-2026-32778: NULL pointer dereference in setContext on retry after an out-of-memory condition (bsc#1259729).
• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
• CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406, CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410, CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
• CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function (bsc#1275732).
• CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
• CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use- after-free can occur (bsc#1275859).
• CVE-2026-77214: out-of-bounds read due to insufficient checks in XML_ParseBuffer() (bsc#1284334).
• CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input (bsc#1282347).
• CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

Update to 2.8.5 (jsc#PED-16154):

• Bug fixes:
• Fix an OOM-related memory leak on a failed overflow check
• Fix memory alignment for architectures with 128bit pointers
• Mark XML_SetHashSalt deprecated
• CMake: only add /source-charset:utf-8 when /utf-8 is not present
• lib: resolve undefined behavior from overshifting a signed int
• lib: support read-only hash table lookup with non-zero-terminated keys
• lib: use a C99 bool for ENTITY.open
• version info bumped from 13:3:12 to 13:4:12
• fix support for 2+ GiB documents (regression from 2.8.2)
• reject empty version in the XML declaration
• fix printf format for AIX
• CMake|AIX: enable EXPAT_DEV_URANDOM by default
• version info bumped from 13:2:12 to 13:3:12
• Existing API function XML_SetHashSalt is now deprecated
• because of its limitations, and its use should be
• considered a vulnerability. Please either use the new API
• function XML_SetHashSalt16Bytes (with known-high-quality
• entropy input only!) instead, or leave the derivation of
• a 16-bytes hash salt from high quality entropy to Expat's
• internal machinery (by not calling either of the two
• XML_SetHashSalt* functions).
• xmlwf: Fix a memory leak
• WASI: Fix format specifiers for 32bit WASI SDK
• Fix a class of false positives where input should have been rejected with error XML_ERROR_ASYNC_ENTITY; regression from earlier security fix (of Expat 2.7.0) …

This update for expat fixes the following issues:

• CVE-2025-59375: denial of service (resource consumption) caused by processing malformed small documents (bsc#1249584).
• CVE-2026-24515: NULL dereference (CWE-476) due to function XML_ExternalEntityParserCreate() failing to copy the encoding handler data passed to XML_SetUnknownEncodingHandler() from the parent to the subparser (bsc#1257144).
• CVE-2026-25210: lack of buffer size check can lead to an integer overflow (bsc#1257496).
• CVE-2026-32776: NULL pointer dereference when processing empty external parameter entities inside an entity declaration value (bsc#1259726).
• CVE-2026-32777: denial of service due to infinite loop in DTD content parsing (bsc#1259711).
• CVE-2026-32778: NULL pointer dereference in setContext on retry after an out-of-memory condition (bsc#1259729).
• CVE-2026-41080: crafted XML document can cause a denial of service (bsc#1262263).
• CVE-2026-45186: denial of service via moderately sized crafted XML input (bsc#1264713).
• CVE-2026-50219: lack of handler call depth tracking for calls to XML_* functions from within handlers in cases of a policy violation (bsc#1267631).
• CVE-2026-56131: lack of handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation (bsc#1268572).
• CVE-2026-56132: heap-based buffer overflow in doProlog in xmlparse.c (bsc#1268573).
• CVE-2026-56403,CVE-2026-56404,CVE-2026-56405,CVE-2026-56406, CVE-2026-56407,CVE-2026-56408,CVE-2026-56409,CVE-2026-56410, CVE-2026-56411,CVE-2026-56412: multiple integer overflow vulnerabilities (bsc#1275115).
• CVE-2026-66046: denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function (bsc#1275732).
• CVE-2026-72522: out-of-bounds read and resultant infinite loop due to low surrogates being treated the same as high surrogates during Unicode processing (bsc#1275594).
• CVE-2026-76641: out-of-bounds read vulnerability that allows attackers to trigger memory corruption (bsc#1275915).
• CVE-2026-76956: denial of service via hash flooding attacks (bsc#1275860).
• CVE-2026-76957: lack of handler call depth tracking with custom encoding callbacks. Thus, a use- after-free can occur (bsc#1275859).
• CVE-2026-77214: out-of-bounds read due to insufficient checks in XML_ParseBuffer() (bsc#1284334).
• CVE-2026-93990: fails to validate low surrogates following high surrogates in UTF-16 input (bsc#1282347).
• CVE-2026-102633: Denial of Service via integer overflow in expat_realloc (bsc#1283493).

Update to 2.8.5 (jsc#PED-16154):

• Bug fixes:
• Fix an OOM-related memory leak on a failed overflow check
• Fix memory alignment for architectures with 128bit pointers
• Mark XML_SetHashSalt deprecated
• CMake: only add /source-charset:utf-8 when /utf-8 is not present
• lib: resolve undefined behavior from overshifting a signed int
• lib: support read-only hash table lookup with non-zero-terminated keys
• lib: use a C99 bool for ENTITY.open
• version info bumped from 13:3:12 to 13:4:12
• fix support for 2+ GiB documents (regression from 2.8.2)
• reject empty version in the XML declaration
• fix printf format for AIX
• CMake|AIX: enable EXPAT_DEV_URANDOM by default
• version info bumped from 13:2:12 to 13:3:12
• Existing API function XML_SetHashSalt is now deprecated
• because of its limitations, and its use should be
• considered a vulnerability. Please either use the new API
• function XML_SetHashSalt16Bytes (with known-high-quality
• entropy input only!) instead, or leave the derivation of
• a 16-bytes hash salt from high quality entropy to Expat's
• internal machinery (by not calling either of the two
• XML_SetHashSalt* functions).
• xmlwf: Fix a memory leak
• WASI: Fix format specifiers for 32bit WASI SDK
• Fix alignment of internal allocations for some non-amd64 architectures (e.g. sparc32); fixes up on the fix to CVE-2025-59375 (of Expat 2.7.2)
• Fix a class of…

This update for MozillaThunderbird fixes the following issues:

Update to Mozilla Thunderbird 153.5 (MFSA 2026-110, bsc#1284493):

• CVE-2026-109704: Privilege escalation in the Application Update component.
• CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component.
• CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
• CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
• CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
• CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing component.
• CVE-2026-109710: Use-after-free in the Graphics: Text component.
• CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
• CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
• CVE-2026-109713: Use-after-free in the Crash Reporting component.
• CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
• CVE-2026-109718: Use-after-free in the XML component.
• CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
• CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
• CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
• CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
• CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109726: Use-after-free in the SVG component.
• CVE-2026-109727: Use-after-free in the Audio/Video component.
• CVE-2026-109728: Use-after-free in the DOM: Animation component.
• CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
• CVE-2026-109730: Integer overflow in the Graphics component.
• CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
• CVE-2026-109732: Use-after-free in the DOM: Streams component.
• CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109734: Mitigation bypass in the DOM: Security component.
• CVE-2026-109736: Frame poisoning in the Layout component.
• CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
• CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
• CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
• CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
• CVE-2026-109742: Information disclosure in the PDF Viewer component.
• CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
• CVE-2026-109744: Other issue in the DOM: File component.
• CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
• CVE-2026-109751: Information disclosure in the Networking component.
• CVE-2026-109752: Use-after-free in the DOM: Workers component.
• CVE-2026-109753: Incorrect boundary conditions in the Layout component.
• CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
• CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
• CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
• CVE-2026-109759: Site isolation issue in the Networking component.
• CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
• CVE-2026-109762: Incorrect boundary conditions in the SVG component.
• CVE-2026-109763: Mitigation bypass in the File Handling component.
• CVE-2026-109764: Mitigation bypass in the Enterprise Policies component. -…

This update for MozillaFirefox fixes the following issues:

Firefox Extended Support Release 153.5.0 ESR (MFSA 2026-108, bsc#1284493):

• CVE-2026-109704: Privilege escalation in the Application Update component.
• CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component.
• CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
• CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
• CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
• CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing component.
• CVE-2026-109710: Use-after-free in the Graphics: Text component.
• CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
• CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
• CVE-2026-109713: Use-after-free in the Crash Reporting component.
• CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
• CVE-2026-109718: Use-after-free in the XML component.
• CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
• CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
• CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
• CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
• CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109726: Use-after-free in the SVG component.
• CVE-2026-109727: Use-after-free in the Audio/Video component.
• CVE-2026-109728: Use-after-free in the DOM: Animation component.
• CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
• CVE-2026-109730: Integer overflow in the Graphics component.
• CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
• CVE-2026-109732: Use-after-free in the DOM: Streams component.
• CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109734: Mitigation bypass in the DOM: Security component.
• CVE-2026-109736: Frame poisoning in the Layout component.
• CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
• CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
• CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
• CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
• CVE-2026-109742: Information disclosure in the PDF Viewer component.
• CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
• CVE-2026-109744: Other issue in the DOM: File component.
• CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
• CVE-2026-109751: Information disclosure in the Networking component.
• CVE-2026-109752: Use-after-free in the DOM: Workers component.
• CVE-2026-109753: Incorrect boundary conditions in the Layout component.
• CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
• CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
• CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
• CVE-2026-109759: Site isolation issue in the Networking component.
• CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
• CVE-2026-109762: Incorrect boundary conditions in the SVG component.
• CVE-2026-109763: Mitigation bypass in the File Handling component.
• CVE-2026-109764: Mitigation bypass in the Enterprise Policies component. -…

This update for MozillaFirefox fixes the following issues:

Firefox Extended Support Release 153.5.0 ESR (MFSA 2026-108, bsc#1284493):

• CVE-2026-109704: Privilege escalation in the Application Update component.
• CVE-2026-109705: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component.
• CVE-2026-109706: Use-after-free in the Storage: IndexedDB component.
• CVE-2026-109707: Sandbox escape due to use-after-free in the Networking component.
• CVE-2026-109708: Sandbox escape due to incorrect boundary conditions in the Networking component.
• CVE-2026-109709: Information disclosure, privilege escalation in the Security: Process Sandboxing component.
• CVE-2026-109710: Use-after-free in the Graphics: Text component.
• CVE-2026-109711: Use-after-free in the Graphics: Canvas2D component.
• CVE-2026-109712: Sandbox escape due to uninitialized memory in the Graphics component.
• CVE-2026-109713: Use-after-free in the Crash Reporting component.
• CVE-2026-109715: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109716: Incorrect boundary conditions in the JavaScript Engine component.
• CVE-2026-109717: Use-after-free in the DOM: Bindings (WebIDL) component.
• CVE-2026-109718: Use-after-free in the XML component.
• CVE-2026-109719: Race condition, use-after-free in the Graphics: CanvasWebGL component.
• CVE-2026-109720: JIT miscompilation in the JavaScript: WebAssembly component.
• CVE-2026-109721: Incorrect boundary conditions in the JavaScript Engine: JIT component.
• CVE-2026-109722: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109723: Integer overflow in the Layout: Text and Fonts component.
• CVE-2026-109724: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109725: Use-after-free in the DOM: Core & HTML component.
• CVE-2026-109726: Use-after-free in the SVG component.
• CVE-2026-109727: Use-after-free in the Audio/Video component.
• CVE-2026-109728: Use-after-free in the DOM: Animation component.
• CVE-2026-109729: Use-after-free in the JavaScript Engine: JIT component.
• CVE-2026-109730: Integer overflow in the Graphics component.
• CVE-2026-109731: Incorrect boundary conditions in the Graphics: Canvas2D component.
• CVE-2026-109732: Use-after-free in the DOM: Streams component.
• CVE-2026-109733: JIT miscompilation in the JavaScript Engine: JIT component.
• CVE-2026-109734: Mitigation bypass in the DOM: Security component.
• CVE-2026-109736: Frame poisoning in the Layout component.
• CVE-2026-109737: Mitigation bypass in the Enterprise Policies component.
• CVE-2026-109738: Use-after-free in the Audio/Video: Playback component.
• CVE-2026-109740: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component.
• CVE-2026-109741: Use-after-free in the Storage: Bucket File System component.
• CVE-2026-109742: Information disclosure in the PDF Viewer component.
• CVE-2026-109743: Privilege escalation in the Panning and Zooming component.
• CVE-2026-109744: Other issue in the DOM: File component.
• CVE-2026-109745: Sandbox escape due to uninitialized memory in the DOM: Web Serial component.
• CVE-2026-109751: Information disclosure in the Networking component.
• CVE-2026-109752: Use-after-free in the DOM: Workers component.
• CVE-2026-109753: Incorrect boundary conditions in the Layout component.
• CVE-2026-109754: Incorrect boundary conditions in the DOM: Editor component.
• CVE-2026-109756: Privilege escalation in the DOM: Navigation component.
• CVE-2026-109757: Sandbox escape due to race condition in the Networking component.
• CVE-2026-109759: Site isolation issue in the Networking component.
• CVE-2026-109760: Mitigation bypass in the Networking: HTTP component.
• CVE-2026-109762: Incorrect boundary conditions in the SVG component.
• CVE-2026-109763: Mitigation bypass in the File Handling component.
• CVE-2026-109764: Mitigation bypass in the Enterprise Policies component. -…

It was discovered that Expat could be made to allocate large amounts of memory when parsing a small crafted document. An attacker could possibly use this issue to cause Expat to consume resources, leading to a denial of service. This issue was only addressed in Ubuntu 24.04 LTS. (CVE-2025-59375)

It was discovered that Expat incorrectly handled empty external parameter entity content. An attacker could possibly use this issue to cause Expat to crash, resulting in a denial of service. (CVE-2026-32776)

It was discovered that Expat incorrectly handled certain DTD content. An attacker could possibly use this issue to cause Expat to enter an infinite loop, resulting in a denial of service. (CVE-2026-32777)

It was discovered that Expat incorrectly handled memory when retrying after an earlier out-of-memory condition. An attacker could possibly use this issue to cause Expat to crash, resulting in a denial of service. (CVE-2026-32778)

It was discovered that Expat performed attribute name collision checks inefficiently. An attacker could possibly use this issue to cause Expat to consume resources when processing a moderately sized crafted XML document, resulting in a denial of service. This issue was only addressed in Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-45186)

It was discovered that Expat used insufficient entropy, allowing hash flooding through a crafted XML document. An attacker could possibly use this issue to cause Expat to consume resources, leading to a denial of service. This issue was only addressed in Ubuntu 14.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-41080)

It was discovered that Expat did not track handler call depth for certain functions called from within handlers, leading to a use-after-free. An attacker could possibly use this issue to cause Expat to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-50219, CVE-2026-56412)

It was discovered that Expat incorrectly handled certain values, leading to integer overflows. An attacker could possibly use this issue to cause Expat to crash, resulting in a denial of service. (CVE-2026-56403, CVE-2026-56404, CVE-2026-56405)

It was discovered that Expat incorrectly handled certain values, leading to an integer overflow. An attacker could possibly use this issue to cause Expat to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-56408)