CVE-2026-86143
Published: September 8, 2026Last modified: September 28, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.3 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L |
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) |