What’s Vulnerable › Vulnerabilities

CVE-2025-55639

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-23 · updated 2026-10-12
• Weakness: CWE-476

Description

GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the gf_isom_add_track_kind() function at isomedia/isom_write.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.

Affected products

• GPAC: before 26.02.0 — fixed in 26.02.0

How to fix

Upgrade to a fixed version: GPAC 26.02.0. Check the vendor advisory for mitigations.

References

• https://github.com/gpac/gpac/commit/027ce139dda498ee95df36db9f9f6f3cadce8ec9
• https://github.com/gpac/gpac/issues/3260
• https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/23/23_poc.mp4
• https://infosec.exchange/@sigdevel/116769184815236865
• http://www.openwall.com/lists/oss-security/2026/06/26/2
• https://github.com/gpac/gpac/issues/3260

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