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Vulnerability · Published Sep 8, 2026 · Assigned by redhat

CVE-2026-74860Libxml2: double-free/uaf in libxml2 python bindings

High 8.5

In plain English

A high-severity security flaw in Cert Manager support for Red Hat OpenShift release 1.20 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.7%top 48.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10libxml22.12.5-10.el10_2.4ALSA-2026:71586
AlmaLinux:8libxml22.9.7-21.el8_10.9ALSA-2026:71641
AlmaLinux:9libxml22.9.13-14.el9_8.5ALSA-2026:71585
AlmaLinux:10libxml2-devel2.12.5-10.el10_2.4ALSA-2026:71586
AlmaLinux:8libxml2-devel2.9.7-21.el8_10.9ALSA-2026:71641
AlmaLinux:9libxml2-devel2.9.13-14.el9_8.5ALSA-2026:71585
AlmaLinux:10libxml2-static2.12.5-10.el10_2.4ALSA-2026:71586
AlmaLinux:10python3-libxml22.12.5-10.el10_2.4ALSA-2026:71586
AlmaLinux:8python3-libxml22.9.7-21.el8_10.9ALSA-2026:71641
AlmaLinux:9python3-libxml22.9.13-14.el9_8.5ALSA-2026:71585
Debian:12libxml2no fix listedDEBIAN-CVE-2026-74860
Debian:13libxml2no fix listedDEBIAN-CVE-2026-74860
Debian:14libxml22.15.3+dfsg-1DEBIAN-CVE-2026-74860
Rocky Linux:10libxml20:2.12.5-10.el10_2.4RLSA-2026:71586
Rocky Linux:8libxml20:2.9.7-21.el8_10.9RLSA-2026:71641
Rocky Linux:9libxml20:2.9.13-14.el9_8.5RLSA-2026:71585
Ubuntu:22.04:LTSlibxml22.9.13+dfsg-1ubuntu0.13UBUNTU-CVE-2026-74860
Ubuntu:22.04:LTSlibxml22.9.13+dfsg-1ubuntu0.13USN-8787-1
Ubuntu:24.04:LTSlibxml22.9.14+dfsg-1.3ubuntu3.9USN-8787-1
Ubuntu:24.04:LTSlibxml22.9.14+dfsg-1.3ubuntu3.9UBUNTU-CVE-2026-74860
Ubuntu:26.04:LTSlibxml22.15.2+dfsg-0.1ubuntu0.2USN-8787-1
Ubuntu:26.04:LTSlibxml22.15.2+dfsg-0.1ubuntu0.2UBUNTU-CVE-2026-74860

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 see references
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 see references
Red Hat Cert Manager support for Red Hat OpenShift release 1.20 see references
Red Hat Red Hat Cost Management On-Premise 1 see references
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.0 see references
Red Hat Red Hat OpenShift AI 3.4 see references
Red Hat Red Hat OpenShift AI 3.4 see references

Weakness: CWE-763 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References