CVE-2026-74860
Publication date 8 September 2026
Last updated 21 September 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libxml2 | 26.04 LTS resolute |
Fixed 2.15.2+dfsg-0.1ubuntu0.2
|
| 24.04 LTS noble |
Fixed 2.9.14+dfsg-1.3ubuntu3.9
|
|
| 22.04 LTS jammy |
Fixed 2.9.13+dfsg-1ubuntu0.13
|
|
| 20.04 LTS focal |
Fixed 2.9.10+dfsg-5ubuntu0.20.04.10+esm5
|
|
| 18.04 LTS bionic |
Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm8
|
|
| 16.04 LTS xenial |
Fixed 2.9.3+dfsg1-1ubuntu0.7+esm13
|
|
| 14.04 LTS trusty |
Fixed 2.9.1+dfsg1-3ubuntu4.13+esm12
|
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CVSS version: CVSS v3.0
Base score
8.5 · High
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8787-1
- libxml2 vulnerabilities
- 21 September 2026