CVE-2026-27821CWE-121

GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow

High · published February 26, 2026

CVSS v4.0
7.7
EPSS
0%
Percentile
34.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.7 · HIGH
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
EPSS
0.00412 · 34.4th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2026-02-26T00:08Z
EPSS history
Timeline
  • 26 FEB 00:08Z
    GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow
    cvelistv5