CVE-2026-27821: Gpac

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Gpac Gpac: up to and including 26.02.0

Published 2026-02-26. Last modified 2026-06-17.