CVE-2026-56131
Published: June 23, 2026Last modified: July 1, 2026
Description
libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.9 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | LOW |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | expat | Fixed (2.8.2-r0) |
| 25 LTS | expat | Fixed (2.8.2-r0) | |
| Stream | expat | Fixed (2.8.2-r0) | |
| Hardened Containers | 23 LTS | expat | Fixed (2.8.2-r0) |
| 25 LTS | expat | Fixed (2.8.2-r0) | |
| Stream | expat | Fixed (2.8.2-r0) |