CVE-2026-76957
Published: August 22, 2026Last modified: September 1, 2026
Description
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | expat | Fixed (2.8.3-r1) |
| 25 LTS | expat | Fixed (2.8.3-r1) | |
| Stream | expat | Fixed (2.8.3-r2) | |
| Hardened Containers | 23 LTS | expat | Fixed (2.8.3-r1) |
| 25 LTS | expat | Fixed (2.8.3-r1) | |
| Stream | expat | Fixed (2.8.3-r2) |