CVE-2026-56132
Published: June 23, 2026Last modified: July 1, 2026
Description
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.9 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/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) |