Libxml2: double-free/uaf in libxml2 python bindings
Summary
| CVE | CVE-2026-74860 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-08 12:16:58 UTC |
| Updated | 2026-09-28 15:17:23 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.004360000 probability, percentile 0.353990000 (date 2026-09-29)
Problem Types: CWE-763 | CWE-763 Release of Invalid Pointer or Reference
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 8.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:2.12.5-10.el10_2.4 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:2.9.7-21.el8_10.9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:2.9.7-21.el8_10.9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.9.13-14.el9_8.5 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:2.9.13-14.el9_8.5 * rpm | Not specified |
| CNA | Red Hat | Cert Manager Support For Red Hat OpenShift Release 1.20 | unaffected 1790589912 * rpm | Not specified |
| CNA | Red Hat | Cert Manager Support For Red Hat OpenShift Release 1.20 | unaffected 1790589914 * rpm | Not specified |
| CNA | Red Hat | Cert Manager Support For Red Hat OpenShift Release 1.20 | unaffected 1790589855 * rpm | Not specified |
| CNA | Red Hat | Red Hat Hardened Images | unaffected 2.15.4-0.1.hum1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 10 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Hardened Images | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
| CNA | Red Hat | Red Hat OpenShift Container Platform 4 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:64463 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:71586 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:72470 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:71585 | [email protected] | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-74860 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:72475 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:71641 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:72476 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-09-08T07:16:42.486Z | Reported to Red Hat. |
| CNA | 2026-03-08T09:20:00.000Z | Made public. |
There are currently no legacy QID mappings associated with this CVE.