Unrated severityNVD Advisory· Published Feb 26, 2026· Updated Feb 26, 2026
GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow
CVE-2026-27821
Description
GPAC is an open-source multimedia framework. In versions up to and including 26.02.0, a stack buffer overflow occurs during NHML file parsing in src/filters/dmx_nhml.c. The value of the xmlHeaderEnd XML attribute is copied from att->value into szXmlHeaderEnd[1000] using strcpy() without any length validation. If the input exceeds 1000 bytes, it overwrites beyond the stack buffer boundary. Commit 9bd7137fded2db40de61a2cf3045812c8741ec52 patches the issue.
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Affected products
2Patches
Vulnerability mechanics
References
2- github.com/gpac/gpac/commit/9bd7137fded2db40de61a2cf3045812c8741ec52mitrex_refsource_MISC
- github.com/gpac/gpac/security/advisories/GHSA-q7qh-8r2r-q559mitrex_refsource_CONFIRM
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