{"id":"CVE-2026-88377","title":"Bento4 1.6.0.0 contains an integer underflow vulnerability in the avcC and hvcC configuration atom parsers","summary":"Bento4 1.6.0.0 contains an integer underflow vulnerability in the avcC and hvcC configuration atom parsers. A specially crafted MP4 file containing an atom with a declared size smaller than AP4_ATOM_HEADER_SIZE can cause AP4_AvccAtom::Cr…","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-191"],"published":"2026-09-24","updated":"2026-09-29","sourceUpdated":"2026-09-29T03:17:20.920","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88377","references":[{"url":"https://github.com/axiomatic-systems/Bento4/issues/1092","label":"cve@mitre.org"},{"url":"https://github.com/axiomatic-systems/Bento4/issues/1092","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-29T02:34:23.040819Z"},"ingestedAt":"2026-09-24T16:47:15.849Z","epss":0.00166,"epssPercentile":0.05767,"slug":"CVE-2026-88377","body":"## Overview\n\nBento4 1.6.0.0 contains an integer underflow vulnerability in the avcC and hvcC configuration atom parsers. A specially crafted MP4 file containing an atom with a declared size smaller than AP4_ATOM_HEADER_SIZE can cause AP4_AvccAtom::Create() or AP4_HvccAtom::Create() to underflow the payload-size calculation. The resulting oversized buffer operation can cause invalid or NULL pointers to be passed to the AP4_DataBuffer copy path, resulting in application termination and denial of service.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":34.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":212225,"id":"CVE-2026-88377","ts":1790652422831,"field":"exploit_available","old":"false","new":"true"},{"seq":212224,"id":"CVE-2026-88377","ts":1790652422831,"field":"cvss","old":null,"new":"6.2"},{"seq":212223,"id":"CVE-2026-88377","ts":1790652422831,"field":"severity","old":"none","new":"medium"}]}