Summary
The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es):
* libxml2: mingw-libxml2: libxml2: Denial of Service via crafted XML input due to use-after-free (CVE-2026-6653)
* libxml2: libxml2: Arbitrary code execution in xmlcatalog utility via buffer overflow (CVE-2026-11979)
* libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow (CVE-2026-86138)
* libxml2: libxml2: Data integrity issues due to integer overflow in write callbacks (CVE-2026-86143)
* libxml2: libxml2: Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements (CVE-2026-86140)
* libxml2: libxml2: Heap-based buffer overflow in xmlXPtrEval due to xpointer length saturation (CVE-2026-86142)
* libxml2: libxml2: Information disclosure, SSRF, or denial of service due to improper parseFlags propagation. (CVE-2026-86144)
* libxml2: double-free/UAF in libxml2 Python bindings (CVE-2026-74860)
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.
Fixed packages 28
| Release | Package | Fixed in |
|---|---|---|
| Rocky Linux · 9 | libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debugsource | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debugsource | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debugsource | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debugsource | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-debugsource | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-devel | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-devel | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-devel | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-devel | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | libxml2-devel | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2 | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
| Rocky Linux · 9 | python3-libxml2-debuginfo | 0:2.9.13-18.el9_9.1 |
Vulnerabilities 8
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High 8.5
Libxml2: double-free/uaf in libxml2 python bindings
A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-fre…
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High 8.0
In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.
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High 7.0
libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.
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Medium 6.9
In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.
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Medium 6.9
In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer …
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Medium 6.9
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to …
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Medium 5.6
In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This h…
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Low 1.8
Stack-Based Buffer Overflow in libxml2
libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long inp…
References
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2491354
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2494191
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2528986
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2528987
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2528989
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2528990
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2528992
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2529697
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advisory
https://access.redhat.com/errata/RHSA-2026:98468