GPAC · CVE-2026-128239 · Package
NO FIX YET · SEE WHAT TO DO
GPAC, a multimedia framework, has a NULL pointer dereference in its MPEG-4 Form constraint handling. A crafted XMT scene file that references a missing group makes the process crash, which is a denial of service.
first public Nov 13, 2026 · 1 source
Check it with your coding agent
It reads this page and tells you if your code or app is affected.
Systems that run GPAC tools such as MP4Box and import XMT scene files from untrusted sources are exposed. Installations that only process trusted media files, or that do not use the XMT Form constraint path, are unlikely to be affected. The sources do not state default configuration details.
Not affected if no-untrusted-xmt-input
Who cares gpac, media-pipelines, mp4box
MP4Box -version or gpac -version to see the installed GPAC version26.07.0; the sources do not name the fixed versionGPAC through 26.07.0 contains a NULL pointer dereference vulnerability in the MPEG-4 Form spatial-constraint handlers in src/compositor/mpeg4_form.c that lets attackers crash the process via unchecked group lookups. Attackers can supply a crafted XMT scene whose Form constraints reference a non-existent group, crashing tools like MP4Box during chapter import for denial of service.
This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
Are you affected?
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.
InfraStack checks it against your stack and answers on your report, with the evidence and the fix.