CVE-2026-56412
Medium
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.
SeverityMedium
CVSS4.9
Exploit probability—
ProductLibexpat
PublishedJun 21, 2026
First seenJun 21, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- libexpat_project libexpat2.8.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libexpat_project libexpat | v < 2.8.2 | 2.8.2 |
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