Medium severity4.9NVD Advisory· Published Jun 21, 2026· Updated Jun 23, 2026
CVE-2026-56412
CVE-2026-56412
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*range: <2.8.2
- (no CPE)range: <2.8.2
- osv-coords6 versionspkg:apk/chainguard/expatpkg:apk/chainguard/expat-devpkg:apk/chainguard/libexpat1pkg:apk/wolfi/expatpkg:apk/wolfi/expat-devpkg:apk/wolfi/libexpat1
< 2.8.2-r0+ 5 more
- (no CPE)range: < 2.8.2-r0
- (no CPE)range: < 2.8.2-r0
- (no CPE)range: < 2.8.2-r0
- (no CPE)range: < 2.8.2-r0
- (no CPE)range: < 2.8.2-r0
- (no CPE)range: < 2.8.2-r0
Patches
Vulnerability mechanics
References
1- github.com/libexpat/libexpat/pull/1278nvdPatchIssue Tracking
News mentions
1- Libexpat: Ten Integer Overflow and Use-After-Free Vulnerabilities Disclosed TogetherVypr Intelligence · Jun 21, 2026