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ALSA-2026:71585 — Important: libxml2 security update

Affected: AlmaLinux:9: libxml2, AlmaLinux:9: libxml2-devel, AlmaLinux:9: python3-libxml2

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es):

* 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.

BELL-CVE-2026-86138

Affected: Alpaquita:25: libxml2, Alpaquita:stream: libxml2, BellSoft Hardened Containers:25: libxml2, BellSoft Hardened Containers:stream: libxml2

EUVD-2026-365291

fkie_cve-2026-86138

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

GHSA-v4gg-2cxp-fc23

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

msrc_CVE-2026-86138 — In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

msrc_CVE-2026-86138

OESA-2026-3884 — libxml2 security update

Affected: openEuler:22.03-LTS-SP4: libxml2

This library allows to manipulate XML files. It includes support to read, modify and write XML and HTML files. There is DTDs support this includes parsing and validation even with complex DtDs, either at parse time or later once the document has been modified. The output can be a simple SAX stream or and in-memory DOM like representations. In this case one can use the built-in XPath and XPointer implementation to select sub nodes or ranges. A flexible Input/Output mechanism is available, with existing HTTP and FTP modules and combined to an URI library. Security Fix(es):

Integer overflow in libxml in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)(CVE-2026-17705)

In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the NXT macro in xmlregexp.(CVE-2026-86137)

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.(CVE-2026-86138)

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.(CVE-2026-86140)

RHSA-2026:64463 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

libxml2: double-free/UAF in libxml2 Python bindings libxml2: libxml2: Denial of Service via out-of-bounds read in xmlFAParsePosCharGroup libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow libxml2: libxml2: Integer overflow in xmlURIEscapeStr may lead to arbitrary code execution libxml2: libxml2: Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements libxml2: libxml2: Denial of Service due to NULL pointer dereference in xmlRegNewParserCtxt libxml2: libxml2: Heap-based buffer overflow in xmlXPtrEval due to xpointer length saturation libxml2: libxml2: Data integrity issues due to integer overflow in write callbacks libxml2: libxml2: Information disclosure, SSRF, or denial of service due to improper parseFlags propagation.

RHSA-2026:71585 — Red Hat Security Advisory: libxml2 security update

libxml2: double-free/UAF in libxml2 Python bindings libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow libxml2: libxml2: Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements libxml2: libxml2: Heap-based buffer overflow in xmlXPtrEval due to xpointer length saturation libxml2: libxml2: Data integrity issues due to integer overflow in write callbacks libxml2: libxml2: Information disclosure, SSRF, or denial of service due to improper parseFlags propagation.

RLSA-2026:71585 — Important: libxml2 security update

Affected: Rocky Linux:9: libxml2

The libxml2 library is a development toolbox providing the implementation of various XML standards.

Security Fix(es):

* 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.

UBUNTU-CVE-2026-86138

Affected: Ubuntu:Pro:14.04:LTS: libxml2, Ubuntu:Pro:16.04:LTS: libxml2, Ubuntu:Pro:18.04:LTS: libxml2, Ubuntu:Pro:20.04:LTS: libxml2, Ubuntu:22.04:LTS: libxml2, Ubuntu:24.04:LTS: libxml2, Ubuntu:26.04:LTS: libxml2

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

WID-SEC-W-2026-3195 — libxml2: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in libxml2 ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Daten zu manipulieren oder offenzulegen und um einen Denial of Service herbeizuführen.