{"id":"CVE-2025-55640","title":"A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.","summary":"A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"adp","ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-26T17:25:53.826480Z"},"exploitAvailable":true,"published":"2026-10-16","updated":"2026-10-26","sourceUpdated":"2026-10-26T17:26:18.665Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-55640","references":[{"url":"https://github.com/gpac/gpac/issues/3261"},{"url":"https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/25/25_poc.mp4"},{"url":"https://github.com/gpac/gpac/commit/321624f28d19a413449fd1718d1eb59037f8f7fc"},{"url":"https://infosec.exchange/@sigdevel/116769271709415444"}],"tags":["cve.org","exploit-available"],"epss":0.00195,"epssPercentile":0.09149,"ingestedAt":"2026-10-16T18:43:08.628Z","slug":"CVE-2025-55640","body":"## Overview\n\nA heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":229686,"id":"CVE-2025-55640","ts":1793036055506,"field":"exploit_available","old":"false","new":"true"},{"seq":229685,"id":"CVE-2025-55640","ts":1793036055506,"field":"cvss","old":null,"new":"5.5"},{"seq":229684,"id":"CVE-2025-55640","ts":1793036055506,"field":"severity","old":"none","new":"medium"}]}