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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-2026-74860

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

fkie_cve-2026-74860

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-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings.

GHSA-8626-cqqj-mfff

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-2026-74860

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