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CVE-2026-4185: GPAC MP4Box allows remote code execution via malicious file

CVE-2026-4185 · published 7 months ago

Summary

The MP4Box tool in GPAC (versions up to the 2.5 development build) can be tricked into overflowing its memory when it processes a specially crafted SWF file. An attacker could use this to run code on the affected system from a distance. Apply the provided update patch to fix the problem.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Ecosystem	Vendor	Product	Affected versions
Debian:11	debian	gpac	All versions
Ubuntu:Pro:24.04:LTS	canonical	gpac	All versions
Ubuntu:Pro:14.04:LTS	canonical	gpac	All versions
Ubuntu:Pro:16.04:LTS	canonical	gpac	All versions
Ubuntu:Pro:18.04:LTS	canonical	gpac	All versions
Ubuntu:Pro:20.04:LTS	canonical	gpac	All versions
Ubuntu:Pro:22.04:LTS	canonical	gpac	All versions

Original advisory text

GPAC MP4Box swf_parse.c swf_def_bits_jpeg stack-based overflow

A vulnerability was found in GPAC up to 2.5-DEV-rev2167-gcc9d617c0-master. This vulnerability affects the function swf_def_bits_jpeg of the file src/scene_manager/swf_parse.c of the component MP4Box. The manipulation of the argument szName results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used. The patch is identified as 8961c74f87ae3fe2d3352e622f7730ca96d50cf1. A patch should be applied to remediate this issue.

References

https://security-tracker.debian.org/tracker/CVE-2026-4185 Vendor Advisory
https://github.com/gpac/gpac/commit/8961c74f87ae3fe2d3352e622f7730ca96d50cf1 Patch
https://www.cve.org/CVERecord?id=CVE-2026-4185 Third Party Advisory
https://ubuntu.com/security/CVE-2026-4185 Third Party Advisory
https://github.com/gpac/gpac/ URL
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4185.j... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-4185 Vendor Advisory
https://vuldb.com/?id.351091 Vendor Advisory
https://vuldb.com/?submit.769840 Vendor Advisory
https://github.com/gpac/gpac/issues/3436 Third Party Advisory
https://vuldb.com/?ctiid.351091 Third Party Advisory
https://github.com/PeterXukt/test_pocs/blob/main/gpac/test.swf Exploit

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

7.9 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-119Buffer Overflow

CWE-121Stack-based Buffer Overflow

Timeline

Published15 Mar 2026

Updated1 Nov 2026

First seen16 Mar 2026

Sources

DEBIAN-CVE-2026-4185 · OSV

CVE-2026-4185 · NVD

UBUNTU-CVE-2026-4185 · OSV

CVE-2026-4185 · OSV

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