CVE-2026-86143
Publication date 5 September 2026
Last updated 8 October 2026
Ubuntu priority
Description
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libxml2 | 26.04 LTS resolute |
Fixed 2.15.2+dfsg-0.1ubuntu0.3
|
| 24.04 LTS noble |
Fixed 2.9.14+dfsg-1.3ubuntu3.10
|
|
| 22.04 LTS jammy |
Fixed 2.9.13+dfsg-1ubuntu0.14
|
|
| 20.04 LTS focal |
Fixed 2.9.10+dfsg-5ubuntu0.20.04.10+esm6
|
|
| 18.04 LTS bionic |
Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm9
|
|
| 16.04 LTS xenial |
Fixed 2.9.3+dfsg1-1ubuntu0.7+esm14
|
|
| 14.04 LTS trusty |
Fixed 2.9.1+dfsg1-3ubuntu4.13+esm13
|
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CVSS version: CVSS v3.0
Base score
6.9 · Medium
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
References
Related Ubuntu Security Notices (USN)
- USN-8910-1
- libxml2 vulnerabilities
- 8 October 2026