CVE-2026-27821
HIGHgpac <= 26.02.0 - Stack-based Buffer Overflow in NHML File Parser
Title source: llmDescription
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/gpac/gpac/security/advisories/GHSA-q7qh-8r2r-q559
Patch x_refsource_misc
https://github.com/gpac/gpac/commit/9bd7137fded2db40de61a2cf3045812c8741ec52
Scores
CVSS v3
7.8
EPSS
0.0027
EPSS Percentile
18.7%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-121
Status
published
Products (1)
gpac/gpac
< 26.02.0
Published
Feb 26, 2026
Tracked Since
Feb 26, 2026