{"id":"CVE-2025-59729","state":"PUBLISHED","title":"Heap-buffer-overflow read in FFmpeg DHAV get_duration","description":"When parsing the header for a DHAV file, there's an integer underflow in offset calculation that leads to reading the duration from before the start of the allocated buffer.\n\nIf we load a DHAV file that is larger than MAX_DURATION_BUFFER_SIZE bytes (0x100000) for example 0x101000 bytes, then at [0] we have size = 0x101000. At [1] we have end_buffer_size = 0x100000, and at [2] we have end_buffer_pos = 0x1000.\n\nThe loop then scans backwards through the buffer looking for the dhav tag; when it is found, we'll calculate end_pos based on a 32-bit offset read from the buffer.\n\nThere is subsequently a check [3] that end_pos is within the section of the file that has been copied into end_buffer, but it only correctly handles the cases where end_pos is before the start of the file or after the section copied into end_buffer, and not the case where end_pos is within the the file, but before the section copied into end_buffer. If we provide such an offset, (end_pos - end_buffer_pos) can underflow, resulting in the subsequent access at [4] occurring before the beginning of the allocation.\n\nWe recommend upgrading to version 8.0 or beyond.","publishedAt":"2025-10-06T08:08:46.060Z","updatedAt":"2025-10-06T16:28:37.534Z","severity":{"score":5.7,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N","source":"Google"},"assigner":"Google","products":["FFmpeg FFmpeg"],"affected":[{"vendor":"FFmpeg","product":"FFmpeg","packageName":"DHAV","defaultStatus":"unaffected","versions":[{"version":"a218cafe4d3be005ab0c61130f90db4d21afb5db","status":"affected","lessThan":"8.0","versionType":"custom"}],"collectionURL":"https://git.ffmpeg.org/ffmpeg.git","modules":["get_duration"],"repo":"https://git.ffmpeg.org/ffmpeg.git"}],"references":["https://issuetracker.google.com/433513232"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:09:39.787Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/59xxx/CVE-2025-59729.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-59729","state":"PUBLISHED","datePublished":"2025-10-06T08:08:46.060Z","dateUpdated":"2025-10-06T16:28:37.534Z","assignerShortName":"Google","assignerOrgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateReserved":"2025-09-19T08:11:37.549Z"},"containers":{"cna":{"title":"Heap-buffer-overflow read in FFmpeg DHAV get_duration","descriptions":[{"lang":"en","value":"When parsing the header for a DHAV file, there's an integer underflow in offset calculation that leads to reading the duration from before the start of the allocated buffer.\n\nIf we load a DHAV file that is larger than MAX_DURATION_BUFFER_SIZE bytes (0x100000) for example 0x101000 bytes, then at [0] we have size = 0x101000. At [1] we have end_buffer_size = 0x100000, and at [2] we have end_buffer_pos = 0x1000.\n\nThe loop then scans backwards through the buffer looking for the dhav tag; when it is found, we'll calculate end_pos based on a 32-bit offset read from the buffer.\n\nThere is subsequently a check [3] that end_pos is within the section of the file that has been copied into end_buffer, but it only correctly handles the cases where end_pos is before the start of the file or after the section copied into end_buffer, and not the case where end_pos is within the the file, but before the section copied into end_buffer. If we provide such an offset, (end_pos - end_buffer_pos) can underflow, resulting in the subsequent access at [4] occurring before the beginning of the allocation.\n\nWe recommend upgrading to version 8.0 or beyond."}],"affected":[{"vendor":"FFmpeg","product":"FFmpeg","packageName":"DHAV","defaultStatus":"unaffected","versions":[{"version":"a218cafe4d3be005ab0c61130f90db4d21afb5db","status":"affected","lessThan":"8.0","versionType":"custom"}],"collectionURL":"https://git.ffmpeg.org/ffmpeg.git","modules":["get_duration"],"repo":"https://git.ffmpeg.org/ffmpeg.git"}],"references":[{"url":"https://issuetracker.google.com/433513232"}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"ADJACENT","baseScore":5.7,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"HIGH","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Google","orgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateUpdated":"2025-10-06T08:08:46.060Z"},"credits":[{"lang":"en","type":"finder","value":"Google Big Sleep"}],"datePublic":"2025-07-21T22:00:00.000Z","impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-10-06T16:25:07.013593Z","id":"CVE-2025-59729","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-06T16:28:37.534Z"}}]}}}