CVE-2026-27821 HIGH

CVE-2026-27821: GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow

Vendor Gpac
Product gpac
Weakness CWE-121
Published February 26, 2026
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 26, 2026 CVE published
February 26, 2026 Record updated