{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90783","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-13T12:01:36.028Z","datePublished":"2026-09-13T12:22:02.443Z","dateUpdated":"2026-09-30T19:07:45.268Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-13T12:22:02.443Z"},"datePublic":"2026-08-25T00:00:00.000Z","title":"MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound","descriptions":[{"lang":"en","value":"MKVToolNix through 101.0 contains a heap buffer overflow in the bundled avilib library's ODML superindex parser due to integer wraparound in 32-bit arithmetic. Attackers can craft a malicious AVI file with oversized entry counts that cause an undersized heap allocation, allowing a heap buffer overflow when the file is parsed with mkvmerge."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Integer Overflow to Buffer Overflow","cweId":"CWE-680","type":"CWE"}]}],"affected":[{"defaultStatus":"unaffected","vendor":"Moritz Bunkus","product":"MKVToolNix","repo":"https://codeberg.org/mbunkus/mkvtoolnix","versions":[{"version":"0","lessThanOrEqual":"101.0","status":"affected","versionType":"custom"},{"version":"1495126138e086080f0163bee27fafbdf956a1d0","status":"unaffected","versionType":"git"}]}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.5,"baseSeverity":"HIGH"}}],"references":[{"url":"https://codeberg.org/mbunkus/mkvtoolnix/commit/1495126138e086080f0163bee27fafbdf956a1d0","tags":["patch"],"name":"Patch Commit"},{"url":"https://codeberg.org/mbunkus/mkvtoolnix/src/tag/release-101.0/lib/avilib-0.6.10/avilib.c#L2552-L2570","tags":["technical-description"],"name":"Unchecked video superindex allocation in avi_parse_input_file() at release-101.0"},{"url":"https://codeberg.org/mbunkus/mkvtoolnix","tags":["product"]},{"name":"VulnCheck Advisory: MKVToolNix through 101.0 Heap Buffer Overflow via avilib ODML Superindex Integer Wraparound","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/mkvtoolnix-through-101.0-heap-buffer-overflow-via-avilib-odml-superindex-integer-wraparound"}],"credits":[{"lang":"en","value":"Tristan Madani","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T17:32:46.690815Z","id":"CVE-2026-90783","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-14T18:14:43.959Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2026/09/msg00040.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-09-30T19:07:45.268Z"}}]}}