CVE-2026-56412
Published: June 23, 2026Last modified: July 1, 2026
Description
libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | LOW |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:L/AC:L/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) |