CVE-2026-108538: GPAC MP4Box os_thread.c gf_mx_v use after free

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-11 · updated 2026-10-15
Weakness: CWE-119

Description

A security vulnerability has been detected in GPAC up to 26.07.0. The impacted element is the function gf_mx_v of the file utils/os_thread.c of the component MP4Box. Such manipulation leads to use after free. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

GPAC: 26.07

References

https://github.com/user-attachments/files/31270809/PoC.zip
https://vuldb.com/cve/CVE-2026-108538
https://vuldb.com/submit/941979
https://vuldb.com/vuln/416193
https://vuldb.com/vuln/416193/cti

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