GPAC MP4Box CVE-2025-55659
MEDIUMSeverity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
A NULL pointer dereference in the ctts_box_write function (isomedia/box_code_base.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.
AnalysisAI
NULL pointer dereference in GPAC MP4Box v2.4 allows unauthenticated remote attackers to crash the application by delivering a crafted MP4 file that a user opens. The vulnerable function ctts_box_write in isomedia/box_code_base.c fails to validate a pointer before dereferencing it when processing a malformed Composition Time to Sample (ctts) box, resulting in a denial-of-service condition. No public exploit code or active exploitation has been identified; SSVC rates exploitation status as none, though delivery is rated automatable.
Technical ContextAI
GPAC is an open-source multimedia framework widely used for MP4/ISOBMFF container parsing, writing, and analysis. MP4Box is its command-line tool for manipulating ISO Base Media File Format files. The ctts_box_write function in isomedia/box_code_base.c is responsible for serializing the Composition Time to Sample box - an optional box in the MP4 container spec that stores per-sample timestamp offsets. CWE-476 (NULL Pointer Dereference) indicates that the function dereferences a pointer that has not been verified as non-NULL, most likely when the ctts box structure references sample table data that is absent or malformed in a crafted input file. The CPE entry in the NVD submission is a placeholder (cpe:2.3:a:n/a:n/a) and provides no additional version enumeration beyond what the description explicitly states (v2.4).
RemediationAI
No vendor-released patch has been identified at time of analysis - no patched version number appears in the available reference data, and no official GPAC security advisory was cited. The only reference is a social media post (https://infosec.exchange/@sigdevel/116710743410087676), which should be consulted for initial disclosure context. As a compensating control, organizations should avoid invoking MP4Box v2.4 on untrusted or externally-sourced MP4 files until a fix is confirmed. For automated pipelines that process user-supplied media, consider sandboxing MP4Box invocations (e.g., via seccomp, containers, or restricted user accounts) so that a crash does not affect upstream service availability. Monitoring the official GPAC GitHub repository for commits addressing ctts_box_write in isomedia/box_code_base.c is recommended to identify when an upstream fix lands, noting that a commit-level fix does not constitute a released patched version until a tagged release is published.
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today