A NULL pointer dereference in the gf_isom_get_user_data_count function (isomedia/isom_read.c) of GPAC MP4Box v2.4 allows attackers to cause…

published 2026-06-09 5mo ago modified 2026-07-23 3mo ago also EUVD-2025-210090

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits: 0; none known

A NULL pointer dereference in the gf_isom_get_user_data_count function (isomedia/isom_read.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

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CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 4mo ago (2026-06-10)

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/4/4_poc.mp4 referenced PoC, tagged "exploit" by a source, unverified
infosec.exchange https://infosec.exchange/@sigdevel/116710512103919834 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /sigdevel/pocs/blob/main/res/gpac/MP4Box/4/4_poc.mp4
exploit
infosec.exchange /@sigdevel/116710512103919834
exploit, mitigation, third-party-advisory
openwall.com /lists/oss-security/2026/06/13/18

Sources

CVE List CVE-2025-55651
NVD CVE-2025-55651

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