CVE-2024-8176

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

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):

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.(CVE-2024-8176)

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):

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.(CVE-2024-8176)

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):

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.(CVE-2024-8176)

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):

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.(CVE-2024-8176)

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):

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.(CVE-2024-8176)

Expat is a C library for parsing XML documents.

Security Fix(es):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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.

XML-RPC is a remote procedure call (RPC) protocol that uses XML to encode its calls and HTTP as a transport mechanism. The xmlrpc-c packages provide a network protocol to allow a client program to make a simple RPC (remote procedure call) over the Internet. It converts an RPC into an XML document, sends it to a remote server using HTTP, and gets back the response in XML.

Security Fix(es):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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.

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

Expat is a C library for parsing XML documents.

Security Fix(es):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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.

XML-RPC is a remote procedure call (RPC) protocol that uses XML to encode its calls and HTTP as a transport mechanism. The xmlrpc-c packages provide a network protocol to allow a client program to make a simple RPC (remote procedure call) over the Internet. It converts an RPC into an XML document, sends it to a remote server using HTTP, and gets back the response in XML.

Security Fix(es):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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):

• libexpat: expat: Improper Restriction of XML Entity Expansion Depth in libexpat (CVE-2024-8176)

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.

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash. This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.

• CVE-2024-8176: fix stack overflow vulnerability in the libexpat library due to the way it handles recursive entity expansion in XML documents

• CVE-2024-8176: fix stack overflow vulnerability when parsing deeply nested entity references

• CVE-2024-8176: fix stack overflow vulnerability when parsing deeply nested entity references

• CVE-2024-8176: fix stack overflow vulnerability when parsing deeply nested entity references

Improper restriction of xml entity expansion depth in libexpat. (CVE-2024-8176) NOTE: upstream deemed this fix incomplete after it was initially pushed. The complete fix was submitted along with the fix for CVE-2025-59375.

Improper restriction of xml entity expansion depth in libexpat. (CVE-2024-8176) This is an extension of the fix published in MGASA-2025-0109 that was determined by upstream to be incomplete. Libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing. (CVE-2025-59375)

These are all security issues fixed in the expat-2.7.1-1.1 package on the GA media of openSUSE Tumbleweed.

Root has patched CVE-2024-8176 in the expat package for Root:Debian:11. Multiple fixed versions available.

This update for expat fixes the following issues:

expat was updated to version 2.7.1:

• Bug fixes:

  • Restore event pointer behavior from Expat 2.6.4 (that the fix to CVE-2024-8176 changed in 2.7.0); affected API functions are:

           - XML_GetCurrentByteCount
           - XML_GetCurrentByteIndex
           - XML_GetCurrentColumnNumber
           - XML_GetCurrentLineNumber
           - XML_GetInputContext
    

• Other changes:

  • Fix printf format specifiers for 32bit Emscripten
  • docs: Promote OpenSSF Best Practices self-certification
  • tests/benchmark: Resolve mistaken double close
  • Address compiler warnings
  • Version info bumped from 11:1:10 (libexpat*.so.1.10.1) to 11:2:10 (libexpat*.so.1.10.2); see https://verbump.de/ for what these numbers do

Version update to 2.7.0 (CVE-2024-8176, bsc#1239618, jsc#PED-12507)

• Security fixes:

• CVE-2024-8176 -- Fix crash from chaining a large number of entities caused by stack overflow by resolving use of recursion, for all three uses of entities: - general entities in character data ('<e>&g1;</e>') - general entities in attribute values ('<e k1='&g1;'/>') - parameter entities ('%p1;')

  Known impact is (reliable and easy) denial of service: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C (Base Score: 7.5, Temporal Score: 7.2) Please note that a layer of compression around XML can significantly reduce the minimum attack payload size.

• Other changes:

  • docs: Add missing documentation of error code XML_ERROR_NOT_STARTED that was introduced with 2.6.4

  • docs: Document need for C++11 compiler for use from C++

  • Address Cppcheck warnings

  • Mass-migrate links from http:// to https://

  • Document changes since the previous release

  • Version info bumped from 11:0:10 (libexpat*.so.1.10.0) to 11:1:10 (libexpat*.so.1.10.1); see https://verbump.de/ for what these numbers do

This update for expat fixes the following issues:

• CVE-2024-8176: Fixed denial of service from chaining a large number of entities caused by stack overflow by resolving use of recursion (bsc#1239618)

Other fixes:

• version update to 2.7.1 (jsc#PED-12500) Bug fixes: #980 #989 Restore event pointer behavior from Expat 2.6.4 (that the fix to CVE-2024-8176 changed in 2.7.0); affected API functions are: - XML_GetCurrentByteCount - XML_GetCurrentByteIndex - XML_GetCurrentColumnNumber - XML_GetCurrentLineNumber - XML_GetInputContext Other changes: #976 #977 Autotools: Integrate files 'fuzz/xml_lpm_fuzzer.{cpp,proto}' with Automake that were missing from 2.7.0 release tarballs #983 #984 Fix printf format specifiers for 32bit Emscripten #992 docs: Promote OpenSSF Best Practices self-certification #978 tests/benchmark: Resolve mistaken double close #986 Address compiler warnings #990 #993 Version info bumped from 11:1:10 (libexpat*.so.1.10.1) to 11:2:10 (libexpat*.so.1.10.2); see https://verbump.de/ for what these numbers do Infrastructure: #982 CI: Start running Perl XML::Parser integration tests #987 CI: Enforce Clang Static Analyzer clean code #991 CI: Re-enable warning clang-analyzer-valist.Uninitialized for clang-tidy #981 CI: Cover compilation with musl #983 #984 CI: Cover compilation with 32bit Emscripten #976 #977 CI: Protect against fuzzer files missing from future release archives

• version update to 2.7.0 #935 #937 Autotools: Make generated CMake files look for libexpat.@[email protected] on macOS #925 Autotools: Sync CMake templates with CMake 3.29 #945 #962 #966 CMake: Drop support for CMake <3.13 #942 CMake: Small fuzzing related improvements #921 docs: Add missing documentation of error code XML_ERROR_NOT_STARTED that was introduced with 2.6.4 #941 docs: Document need for C++11 compiler for use from C++ #959 tests/benchmark: Fix a (harmless) TOCTTOU #944 Windows: Fix installer target location of file xmlwf.xml for CMake #953 Windows: Address warning -Wunknown-warning-option about -Wno-pedantic-ms-format from LLVM MinGW #971 Address Cppcheck warnings #969 #970 Mass-migrate links from http:// to https:// #947 #958 .. #974 #975 Document changes since the previous release #974 #975 Version info bumped from 11:0:10 (libexpat*.so.1.10.0) to 11:1:10 (libexpat*.so.1.10.1); see https://verbump.de/ for what these numbers do

  • Version info bumped from 9:3:8 to 9:4:8; see https://verbump.de/ for what these numbers do

This update for expat fixes the following issues:

• CVE-2024-8176: Fixed denial of service from chaining a large number of entities caused by stack overflow by resolving use of recursion (bsc#1239618)

Other fixes:

• version update to 2.7.1 (jsc#PED-12500) Bug fixes: #980 #989 Restore event pointer behavior from Expat 2.6.4 (that the fix to CVE-2024-8176 changed in 2.7.0); affected API functions are: - XML_GetCurrentByteCount - XML_GetCurrentByteIndex - XML_GetCurrentColumnNumber - XML_GetCurrentLineNumber - XML_GetInputContext Other changes: #976 #977 Autotools: Integrate files 'fuzz/xml_lpm_fuzzer.{cpp,proto}' with Automake that were missing from 2.7.0 release tarballs #983 #984 Fix printf format specifiers for 32bit Emscripten #992 docs: Promote OpenSSF Best Practices self-certification #978 tests/benchmark: Resolve mistaken double close #986 Address compiler warnings #990 #993 Version info bumped from 11:1:10 (libexpat*.so.1.10.1) to 11:2:10 (libexpat*.so.1.10.2); see https://verbump.de/ for what these numbers do Infrastructure: #982 CI: Start running Perl XML::Parser integration tests #987 CI: Enforce Clang Static Analyzer clean code #991 CI: Re-enable warning clang-analyzer-valist.Uninitialized for clang-tidy #981 CI: Cover compilation with musl #983 #984 CI: Cover compilation with 32bit Emscripten #976 #977 CI: Protect against fuzzer files missing from future release archives

• version update to 2.7.0 #935 #937 Autotools: Make generated CMake files look for libexpat.@[email protected] on macOS #925 Autotools: Sync CMake templates with CMake 3.29 #945 #962 #966 CMake: Drop support for CMake <3.13 #942 CMake: Small fuzzing related improvements #921 docs: Add missing documentation of error code XML_ERROR_NOT_STARTED that was introduced with 2.6.4 #941 docs: Document need for C++11 compiler for use from C++ #959 tests/benchmark: Fix a (harmless) TOCTTOU #944 Windows: Fix installer target location of file xmlwf.xml for CMake #953 Windows: Address warning -Wunknown-warning-option about -Wno-pedantic-ms-format from LLVM MinGW #971 Address Cppcheck warnings #969 #970 Mass-migrate links from http:// to https:// #947 #958 .. #974 #975 Document changes since the previous release #974 #975 Version info bumped from 11:0:10 (libexpat*.so.1.10.0) to 11:1:10 (libexpat*.so.1.10.1); see https://verbump.de/ for what these numbers do

This update for expat fixes the following issues:

• CVE-2024-8176: Fixed denial of service from chaining a large number of entities caused by stack overflow by resolving use of recursion (bsc#1239618)

Other fixes:

• version update to 2.7.1 (jsc#PED-12500) Bug fixes: #980 #989 Restore event pointer behavior from Expat 2.6.4 (that the fix to CVE-2024-8176 changed in 2.7.0); affected API functions are: - XML_GetCurrentByteCount - XML_GetCurrentByteIndex - XML_GetCurrentColumnNumber - XML_GetCurrentLineNumber - XML_GetInputContext Other changes: #976 #977 Autotools: Integrate files 'fuzz/xml_lpm_fuzzer.{cpp,proto}' with Automake that were missing from 2.7.0 release tarballs #983 #984 Fix printf format specifiers for 32bit Emscripten #992 docs: Promote OpenSSF Best Practices self-certification #978 tests/benchmark: Resolve mistaken double close #986 Address compiler warnings #990 #993 Version info bumped from 11:1:10 (libexpat*.so.1.10.1) to 11:2:10 (libexpat*.so.1.10.2); see https://verbump.de/ for what these numbers do Infrastructure: #982 CI: Start running Perl XML::Parser integration tests #987 CI: Enforce Clang Static Analyzer clean code #991 CI: Re-enable warning clang-analyzer-valist.Uninitialized for clang-tidy #981 CI: Cover compilation with musl #983 #984 CI: Cover compilation with 32bit Emscripten #976 #977 CI: Protect against fuzzer files missing from future release archives

• version update to 2.7.0 #935 #937 Autotools: Make generated CMake files look for libexpat.@[email protected] on macOS #925 Autotools: Sync CMake templates with CMake 3.29 #945 #962 #966 CMake: Drop support for CMake <3.13 #942 CMake: Small fuzzing related improvements #921 docs: Add missing documentation of error code XML_ERROR_NOT_STARTED that was introduced with 2.6.4 #941 docs: Document need for C++11 compiler for use from C++ #959 tests/benchmark: Fix a (harmless) TOCTTOU #944 Windows: Fix installer target location of file xmlwf.xml for CMake #953 Windows: Address warning -Wunknown-warning-option about -Wno-pedantic-ms-format from LLVM MinGW #971 Address Cppcheck warnings #969 #970 Mass-migrate links from http:// to https:// #947 #958 .. #974 #975 Document changes since the previous release #974 #975 Version info bumped from 11:0:10 (libexpat*.so.1.10.0) to 11:1:10 (libexpat*.so.1.10.1); see https://verbump.de/ for what these numbers do

This update for expat fixes the following issues:

Version update to 2.7.1:

• Bug fixes:

  • Restore event pointer behavior from Expat 2.6.4 (that the fix to CVE-2024-8176 changed in 2.7.0); affected API functions are:

    • XML_GetCurrentByteCount
    • XML_GetCurrentByteIndex
    • XML_GetCurrentColumnNumber
    • XML_GetCurrentLineNumber
    • XML_GetInputContext

  • Other changes: #976 #977 Autotools: Integrate files "fuzz/xml_lpm_fuzzer.{cpp,proto}" with Automake that were missing from 2.7.0 release tarballs #983 #984 Fix printf format specifiers for 32bit Emscripten #992 docs: Promote OpenSSF Best Practices self-certification #978 tests/benchmark: Resolve mistaken double close #986 Address compiler warnings #990 #993 Version info bumped from 11:1:10 (libexpat*.so.1.10.1) to 11:2:10 (libexpat*.so.1.10.2); see https://verbump.de/ for what these numbers do

    Infrastructure:
        #982  CI: Start running Perl XML::Parser integration tests
        #987  CI: Enforce Clang Static Analyzer clean code
        #991  CI: Re-enable warning clang-analyzer-valist.Uninitialized
                for clang-tidy
        #981  CI: Cover compilation with musl
    

    #983 #984 CI: Cover compilation with 32bit Emscripten #976 #977 CI: Protect against fuzzer files missing from future release archives

Version update to 2.7.0 (CVE-2024-8176 [bsc#1239618])

• Security fixes:

  • CVE-2024-8176 -- Fix crash from chaining a large number of entities caused by stack overflow by resolving use of recursion, for all three uses of entities:
    • general entities in character data ("<e>&g1;</e>")
    • general entities in attribute values ("<e k1='&g1;'/>")
    • parameter entities ("%p1;")

  Known impact is (reliable and easy) denial of service:

  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C

  (Base Score: 7.5, Temporal Score: 7.2)

  Please note that a layer of compression around XML can significantly reduce the minimum attack payload size.

  • Other changes:
    • Document changes since the previous release
    • Version info bumped from 11:0:10 (libexpat*.so.1.10.0) to 11:1:10 (libexpat*.so.1.10.1); see https://verbump.de/ for what these numbers do

Version update to 2.6.4:

• Security fixes: [bsc#1232601][bsc#1232579]
  • CVE-2024-50602 -- Fix crash within function XML_ResumeParser from a NULL pointer dereference by disallowing function XML_StopParser to (stop or) suspend an unstarted parser. A new error code XML_ERROR_NOT_STARTED was introduced to properly communicate this situation. // CWE-476 CWE-754
• Other changes:
  • Version info bumped from 10:3:9 (libexpat*.so.1.9.3) to 11:0:10 (libexpat*.so.1.10.0); see https://verbump.de/ for what these numbers do

Update to 2.6.3:

• Security fixes:
  • CVE-2024-45490, bsc#1229930 -- Calling function XML_ParseBuffer with len < 0 without noticing and then calling XML_GetBuffer will have XML_ParseBuffer fail to recognize the problem and XML_GetBuffer corrupt memory. With the fix, XML_ParseBuffer now complains with error XML_ERROR_INVALID_ARGUMENT just like sibling XML_Parse has been doing since Expat 2.2.1, and now documented. Impact is denial of service to potentially artitrary code execution.
  • CVE-2024-45491, bsc#1229931 -- Internal function dtdCopy can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX). Impact is denial of service to potentially artitrary code execution.
  • CVE-2024-45492, bsc#1229932 -- Internal function nextScaffoldPart can have an integer overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX). Impact is denial of service to potentially…