CVE-2026-74860

Libxml2: double-free/uaf in libxml2 python bindings

State: Published
Severity: 8.5 High
Published: Sep 8, 2026
Updated: Nov 2, 2026
Reserved: Aug 17, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H	redhat

Weaknesses

CWE-763 Release of Invalid Pointer or Reference

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:2.12.5-10.el10_2.4 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:2.12.5-9.el10_0.9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.9.7-21.el8_10.9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.9.7-21.el8_10.9 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:2.9.7-9.el8_4.20 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:2.9.7-9.el8_4.20 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.9.7-13.el8_6.24 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.9.7-13.el8_6.24 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.9.7-16.el8_8.24 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.9.7-16.el8_8.24 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.9.13-14.el9_8.5 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.9.13-14.el9_8.5 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.9.13-3.el9_2.20 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.9.13-13.el9_4.10 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.9.13-13.el9_6 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat	1790589912 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat	1790589914 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat	1790589855 and laterNot affected
Red Hat Cost Management On-Premise 1Red Hat	1791460851 and laterNot affected
Red Hat Hardened ImagesRed Hat	2.15.4-0.1.hum1 and laterNot affected
Red Hat OpenShift AI 3.0Red Hat	1793041986 and laterNot affected
Red Hat OpenShift AI 3.0Red Hat	1793041981 and laterNot affected
Red Hat OpenShift AI 3.0Red Hat	1793042072 and laterNot affected
Red Hat OpenShift AI 3.0Red Hat	1793042067 and laterNot affected
Red Hat OpenShift AI 3.0Red Hat	1793041987 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042006 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042145 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042006 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042011 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042086 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042088 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793041995 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042074 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat	1793042008 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042010 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042162 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042004 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042092 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042117 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042093 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042114 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042024 and laterNot affected
Red Hat OpenShift AI 3.5Red Hat	1793042008 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1791978534 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1791978528 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1791978528 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1791964013 and laterNot affected
Red Hat Update Infrastructure 5Red Hat	1791978693 and laterNot affected
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat
Red Hat Hardened ImagesRed Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 4Red Hat
Red Hat OpenShift Container Platform 5Red Hat

References

RHSA-2026:64463vendor-advisory
RHSA-2026:71585vendor-advisory
RHSA-2026:71586vendor-advisory
RHSA-2026:71641vendor-advisory
RHSA-2026:72470vendor-advisory
RHSA-2026:72475vendor-advisory
RHSA-2026:72476vendor-advisory
RHSA-2026:79357vendor-advisory
RHSA-2026:82939vendor-advisory
RHSA-2026:89750vendor-advisory
RHSA-2026:89759vendor-advisory
RHSA-2026:90309vendor-advisory
RHSA-2026:91202vendor-advisory
RHSA-2026:91204vendor-advisory
RHSA-2026:91206vendor-advisory
RHSA-2026:91207vendor-advisory
RHSA-2026:91217vendor-advisory
RHSA-2026:91218vendor-advisory
RHSA-2026:91219vendor-advisory
RHSA-2026:91224vendor-advisory
RHSA-2026:91232vendor-advisory
RHSA-2026:91233vendor-advisory
RHSA-2026:91234vendor-advisory
RHSA-2026:91235vendor-advisory
RHSA-2026:91236vendor-advisory
RHSA-2026:91237vendor-advisory
RHSA-2026:91238vendor-advisory
RHSA-2026:91241vendor-advisory
RHSA-2026:91242vendor-advisory
RHSA-2026:91243vendor-advisory
RHSA-2026:91244vendor-advisory
RHSA-2026:91245vendor-advisory
RHSA-2026:91246vendor-advisory
RHSA-2026:91248vendor-advisory
RHSA-2026:91249vendor-advisory
RHSA-2026:92352vendor-advisory
RHSA-2026:92589vendor-advisory
RHSA-2026:93463vendor-advisory
RHSA-2026:93473vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-74860vdb-entry
RHBZ#2529697issue-tracking

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