What’s Vulnerable › Vulnerabilities

CVE-2026-9567: GPAC MP4Box isom_intern.c MergeFragment null pointer dereference

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-26 · updated 2026-07-23
• Weakness: CWE-404

Description

A security flaw has been discovered in GPAC up to 2.4.0. Affected is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. The manipulation results in null pointer dereference. The attack needs to be approached locally. The exploit has been released to the public and may be used for attacks. The patch is identified as 525bf1af642c30af04e4df5345e6d798c0a4d8a1. It is advisable to implement a patch to correct this issue.

Affected products

• GPAC: 2.0, 2.1, 2.2, 2.3, 2.4.0

References

• https://github.com/gpac/gpac/
• https://github.com/gpac/gpac/issues/3549
• https://github.com/makesoftwaresafe/gpac/commit/525bf1af642c30af04e4df5345e6d798c0a4d8a1
• https://github.com/user-attachments/files/27196918/poc.zip
• https://vuldb.com/submit/816075
• https://vuldb.com/vuln/365629
• https://vuldb.com/vuln/365629/cti

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