CVE-2026-74860: Red Hat Libxml2: double-free/uaf in libxml2 python bindings
This Red Hat advisory covers CVE-2026-74860 in Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 and Red Hat Enterprise Linux 9.
Key facts
- Vendor rating
- High, CVSS 8.5
- CISA KEV
- Not listed (catalogue checked )
- Fixed in
- libxml2-0:2.12.5-10.el10_2.4, libxml2-0:2.9.7-21.el8_10.9, libxml2-0:2.9.13-14.el9_8.5 and 13 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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. Red Hat severity: Important — CVSS 8.5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H).
Weakness: CWE-763. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Cert Manager support for Red Hat OpenShift release 1.20; Red Hat Cost Management On-Premise 1; Red Hat Hardened Images; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat fixing advisory: RHSA-2026:71586, RHSA-2026:71641, RHSA-2026:71585, RHSA-2026:72470, RHSA-2026:72475, RHSA-2026:72476, RHSA-2026:79357, RHSA-2026:64463.
Affected products named by the advisory: Red Hat package: libxml2.
Text from the source record.
How to fix CVE-2026-74860
Upgrade to a fixed release named by Red Hat:
- libxml2-0:2.12.5-10.el10_2.4
- libxml2-0:2.9.7-21.el8_10.9
- libxml2-0:2.9.13-14.el9_8.5
- cert-manager/jetstack-cert-manager-rhel9:1790589912
- cert-manager/cert-manager-istio-csr-rhel9:1790589914
- cert-manager/cert-manager-operator-rhel9:1790589855
- costmanagement/costmanagement-ui-rhel10:1791460851
- libxml2-main-2.15.4-0.1.hum1
- RHSA-2026:71586
- RHSA-2026:71641
- RHSA-2026:71585
- RHSA-2026:72470
- RHSA-2026:72475
- RHSA-2026:72476
- RHSA-2026:79357
- RHSA-2026:64463
Support dates for the fixed release lines
- Red Hat Enterprise Linux 10: support ends
- Red Hat Enterprise Linux 8: support ends
CVE-2026-74860 in other vendors' advisories
- Veeam: KB4825
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