CVE-2026-74860
Published: September 10, 2026Last modified: September 28, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.5 |
| Attack Vector | NETWORK |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | CHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | libxml2 | Unknown (2.10.3-r2) |
| 25 LTS | libxml2 | Unknown (2.13.8-r0) | |
| Stream | libxml2 | Fixed (2.13.9-r6) | |
| Hardened Containers | 23 LTS | libxml2 | Unknown (2.10.3-r2) |
| 25 LTS | libxml2 | Unknown (2.13.8-r0) | |
| Stream | libxml2 | Unknown (2.10.3-r2) |
References
- https://access.redhat.com/errata/RHSA-2026:64463
- https://access.redhat.com/errata/RHSA-2026:71585
- https://access.redhat.com/errata/RHSA-2026:71586
- https://access.redhat.com/errata/RHSA-2026:71641
- https://access.redhat.com/security/cve/CVE-2026-74860
- https://bugzilla.redhat.com/show_bug.cgi?id=2529697
- https://gitlab.gnome.org/GNOME/libxml2/-/commit/f41e1865781f74d1cadfe2fbdfeefed946026f12
- https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/397
- https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1076