CVE-2026-2297

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.(CVE-2026-2297)

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().(CVE-2026-4519)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.(CVE-2026-2297)

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().(CVE-2026-4519)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.(CVE-2026-2297)

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().(CVE-2026-4519)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.(CVE-2026-2297)

The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().(CVE-2026-4519)

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)

• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)

• cpython: Out-of-memory when loading Plist (CVE-2025-13837)

• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)

• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)

• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)

• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)

• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

• python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)

• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)

• cpython: Out-of-memory when loading Plist (CVE-2025-13837)

• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)

• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)

• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)

• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)

• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)

• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

• python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)

• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)

• cpython: Out-of-memory when loading Plist (CVE-2025-13837)

• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)

• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)

• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)

• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)

• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)

• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)

• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)

• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)

• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

Root has patched CVE-2026-2297 in the rootio-python3.11 package for Root:Debian:12. Multiple fixed versions available.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)
• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)
• cpython: Out-of-memory when loading Plist (CVE-2025-13837)
• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)
• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)
• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)
• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)
• python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)
• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)
• cpython: Out-of-memory when loading Plist (CVE-2025-13837)
• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)
• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)
• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)
• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)
• python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)

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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing (CVE-2025-59375)
• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)
• cpython: Out-of-memory when loading Plist (CVE-2025-13837)
• cpython: Header injection via newlines in data URL mediatype in Python (CVE-2025-15282)
• cpython: Header injection in http.cookies.Morsel in Python (CVE-2026-0672)
• cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
• cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
• cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
• python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
• python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
• python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
• python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)

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.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

• CVE-2025-8291: fix zipfile ZIP64 EOCD Locator offset validation
• CVE-2025-6069: fix quadratic complexity in HTMLParser
• CVE-2025-4516: fix use-after-free in unicode-escape decoder with error handler
• CVE-2026-2297: ensure SourcelessFileLoader uses io.open_code
• CVE-2026-3479: reject invalid resource arguments in pkgutil.get_data()
• CVE-2025-1795: fix email header list separator incorrectly encoded during folding
• CVE-2026-0672: reject control characters in http cookies
• CVE-2025-15282: reject control characters in data URL mediatypes
• CVE-2026-3644: reject control characters in http.cookies.Morsel.update(), |=, unpickling, and js_output()
• CVE-2026-4224: avoid unbound C recursion in conv_content_model in pyexpat.c
• CVE-2025-11468: preserve parens when folding email comments to prevent header injection

• CVE-2026-0672: reject control characters in http.cookies cookie names, values, and parameters to prevent header injection
• CVE-2026-3644: reject control characters in Morsel.update(), |= operator, and unpickling paths missed by CVE-2026-0672; add output validation to BaseCookie.js_output()
• CVE-2026-2297: ensure SourcelessFileLoader uses io.open_code so sys.audit handlers fire for legacy .pyc imports
• CVE-2025-8291: validate ZIP64 End of Central Directory locator offset to prevent ZIP archive parser confusion
• CVE-2025-6069: fix quadratic complexity in html.parser.HTMLParser when processing crafted malformed inputs
• CVE-2025-4516: fix use-after-free in unicode-escape decoder when an error handler is invoked
• CVE-2025-1795: stop incorrectly RFC 2047 encoding the comma separator when an address list is folded

• CVE-2026-4224: avoid unbound C recursion in conv_content_model in pyexpat
• CVE-2026-3644: reject control characters in http.cookies.Morsel.update()
• CVE-2026-0672: reject control characters in http.cookies.Morsel
• CVE-2025-8291: check consistency of zip64 end of central directory record
• CVE-2025-6069: fix quadratic complexity in processing special input in HTMLParser
• CVE-2025-4516: fix use-after-free in the unicode-escape decoder with error handler
• CVE-2025-15282: reject control characters in data URL mediatypes
• CVE-2025-11468: preserve parenthesis when folding email comments
• CVE-2026-3479: reject invalid resource arguments in pkgutil.get_data()
• CVE-2026-2297: ensure SourcelessFileLoader uses io.open_code
• CVE-2024-5642: disallow setting an empty list for ssl NPN protocols

Please see the references for additional information about vulnerabilities.

These are all security issues fixed in the python312-3.12.13-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python311-3.11.15-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python313-3.13.12-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python310-3.10.20-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python314-3.14.3-3.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python315-3.15.0~a8-1.1 package on the GA media of openSUSE Tumbleweed.

This update for python313 fixes the following issues:

Update to version 3.13.13.

• CVE-2025-13462: incorrect parsing of TarInfo when GNU long name and type AREGTYPE are combined can lead to misinterpretation of tar archives (bsc#1259611).
• CVE-2026-2297: incorrectly handled hook in FileLoader can lead to validation bypass (bsc#1259240).
• CVE-2026-3479: improper resource argument validation in pkgutil.get_data() can lead to path traversal (bsc#1259989).
• CVE-2026-3644: incomplete control character validation in http.cookies can lead to input validation bypass (bsc#1259734).
• CVE-2026-4224: parsing XML with deeply nested DTD content models can lead to C stack overflow (bsc#1259735).
• CVE-2026-4519: failure to sanitize leading dashes in URLs in the webbrowser.open() API can lead to web browser command line option injection (bsc#1260026).

The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.

This update for python39 fixes the following issue:

• CVE-2026-2297: validation bypass via incorrectly handled hook in FileLoader (bsc#1259240).

This update for python310 fixes the following issues:

Update to Python 3.10.20:

• CVE-2025-6075: quadratic complexity in os.path.expandvars() (bsc#1252974).
• CVE-2025-11468: header injection with carefully crafted inputs (bsc#1257029).
• CVE-2025-12084: quadratic complexity in xml.minidom node ID cache clearing (bsc#1254997).
• CVE-2025-13836: potential memory denial of service in the http.client module (bsc#1254400).
• CVE-2025-13837: potential memory denial of service in the plistlib module (bsc#1254401).
• CVE-2026-0672: control characters in http.cookies.Morsel fields and values (bsc#1257031).
• CVE-2026-0865: C0 control characters within wsgiref.headers.Headers fields, values, and parameters (bsc#1257042).
• CVE-2026-1299: header injection when an email is serialized due to improper newline quoting (bsc#1257181).
• CVE-2026-2297: validation bypass via incorrectly handled hook in FileLoader (bsc#1259240).

Changelog:

• Update to 3.10.20:
• gh-144125: BytesGenerator will now refuse to serialize (write) headers that are unsafely folded or delimited; see verify_generated_headers. (Contributed by Bas Bloemsaat and Petr Viktorin in gh-121650) (bsc#1257181, CVE-2026-1299).
• gh-143935: Fixed a bug in the folding of comments when flattening an email message using a modern email policy. Comments consisting of a very long sequence of non-foldable characters could trigger a forced line wrap that omitted the required leading space on the continuation line, causing the remainder of the comment to be interpreted as a new header field. This enabled header injection with carefully crafted inputs (bsc#1257029 CVE-2025-11468).
• gh-143925: Reject control characters in data: URL media types.
• gh-143919: Reject control characters in http.cookies.Morsel fields and values (bsc#1257031, CVE-2026-0672).
• gh-143916: Reject C0 control characters within wsgiref.headers.Headers fields, values, and parameters (bsc#1257042, CVE-2026-0865).
• gh-142145: Remove quadratic behavior in xml.minidom node ID cache clearing. In order to do this without breaking existing users, we also add the ownerDocument attribute to xml.dom.minidom elements and attributes created by directly instantiating the Element or Attr class. Note that this way of creating nodes is not supported; creator functions like xml.dom.Document.documentElement() should be used instead (bsc#1254997, CVE-2025-12084).
• gh-137836: Add support of the 'plaintext' element, RAWTEXT elements 'xmp', 'iframe', 'noembed' and 'noframes', and optionally RAWTEXT element 'noscript' in html.parser.HTMLParser.
• gh-136063: email.message: ensure linear complexity for legacy HTTP parameters parsing. Patch by B�n�dikt Tran.
• gh-136065: Fix quadratic complexity in os.path.expandvars() (bsc#1252974, CVE-2025-6075).
• gh-119451: Fix a potential memory denial of service in the http.client module. When connecting to a malicious server, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes (CVE-2025-13836, bsc#1254400).
• gh-119452: Fix a potential memory denial of service in the http.server module. When a malicious user is connected to the CGI server on Windows, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes.
• gh-119342: Fix a potential memory denial of service in the plistlib module. When reading a Plist file received from untrusted source, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes (bsc#1254401, CVE-2025-13837).
• Library
• gh-144833: Fixed a use-after-free in ssl when SSL_new() …

This update for python312 fixes the following issues:

Update to Python 3.12.13:

• CVE-2025-6075: quadratic complexity in os.path.expandvars() (bsc#1252974).
• CVE-2025-11468: header injection with carefully crafted inputs (bsc#1257029).
• CVE-2025-12084: quadratic complexity in xml.minidom node ID cache clearing (bsc#1254997).
• CVE-2025-13836: potential memory denial of service in the http.client module (bsc#1254400).
• CVE-2025-13837: potential memory denial of service in the plistlib module (bsc#1254401).
• CVE-2025-15282: user-controlled data URLs parsed may allow injecting headers (bsc#1257046).
• CVE-2026-0672: control characters in http.cookies.Morsel fields and values (bsc#1257031).
• CVE-2026-0865: C0 control characters within wsgiref.headers.Headers fields, values, and parameters (bsc#1257042).
• CVE-2026-1299: header injection when an email is serialized due to improper newline quoting (bsc#1257181).
• CVE-2026-2297: validation bypass via incorrectly handled hook in FileLoader (bsc#1259240).

Changelog:

• gh-144125: BytesGenerator will now refuse to serialize (write) headers that are unsafely folded or delimited; see verify_generated_headers. (Contributed by Bas Bloemsaat and Petr Viktorin in gh-121650) (bsc#1257181, CVE-2026-1299).
• gh-143935: Fixed a bug in the folding of comments when flattening an email message using a modern email policy. Comments consisting of a very long sequence of non-foldable characters could trigger a forced line wrap that omitted the required leading space on the continuation line, causing the remainder of the comment to be interpreted as a new header field. This enabled header injection with carefully crafted inputs (bsc#1257029 CVE-2025-11468).
• gh-143925: Reject control characters in data: URL media types (bsc#1257046, CVE-2025-15282).
• gh-143919: Reject control characters in http.cookies.Morsel fields and values (bsc#1257031, CVE-2026-0672).
• gh-143916: Reject C0 control characters within wsgiref.headers.Headers fields, values, and parameters (bsc#1257042, CVE-2026-0865).
• gh-142145: Remove quadratic behavior in xml.minidom node ID cache clearing. In order to do this without breaking existing users, we also add the ownerDocument attribute to xml.dom.minidom elements and attributes created by directly instantiating the Element or Attr class. Note that this way of creating nodes is not supported; creator functions like xml.dom.Document.documentElement() should be used instead (bsc#1254997, CVE-2025-12084).
• gh-137836: Add support of the 'plaintext' element, RAWTEXT elements 'xmp', 'iframe', 'noembed' and 'noframes', and optionally RAWTEXT element 'noscript' in html.parser.HTMLParser.
• gh-136063: email.message: ensure linear complexity for legacy HTTP parameters parsing. Patch by B�n�dikt Tran.
• gh-136065: Fix quadratic complexity in os.path.expandvars() (bsc#1252974, CVE-2025-6075).
• gh-119451: Fix a potential memory denial of service in the http.client module. When connecting to a malicious server, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes (CVE-2025-13836, bsc#1254400).
• gh-119452: Fix a potential memory denial of service in the http.server module. When a malicious user is connected to the CGI server on Windows, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes.
• gh-119342: Fix a potential memory denial of service in the plistlib module. When reading a Plist file received from untrusted source, it could cause an arbitrary amount of memory to be allocated. This could have led to symptoms including a MemoryError, swapping, out of memory (OOM) killed processes or containers, or even system crashes …