{"id":"CVE-2026-120246","aliases":[],"cve":{"records":[{"id":"CVE-2026-120246","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-31T22:05:58.551Z","published":"2026-11-01T00:57:11.435Z","modified":"2026-11-05T15:37:47.734Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-01T00:57:11.435Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-05T15:37:47.734Z"}],"references":[{"url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24856","tags":["issue-tracking"],"source":"VulnCheck"},{"url":"https://github.com/FFmpeg/FFmpeg/commit/47313ad3f9f33b892384b976fb7c09b3c85fd74e","tags":["patch"],"source":"VulnCheck"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cdxl.c#L226-L229","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/FFmpeg/FFmpeg","tags":["product"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/ffmpeg-4.4-through-9.0.2-uninitialized-memory-disclosure-via-cdxl-ham-decoder","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-457","description":"Use of Uninitialized Variable","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndIncluding":"9.0.2"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-05T15:37:33.214014Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"FFmpeg 4.4 through 9.0.2 Uninitialized Memory Disclosure via CDXL HAM Decoder","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"FFmpeg 4.4 through 9.0.2 contains a use of uninitialized variable vulnerability in the CDXL decoder that leaks stack memory into decoded pixels via unfilled HAM palette entries. Attackers can craft a type-0 CDXL file whose HAM pixels select unfilled new_palette entries in cdxl_decode_ham8() or cdxl_decode_ham6(), exposing stack bytes and pointer fragments in the BGR24 output.","score":6.8,"severity":"medium","published":"2026-11-01T00:57:11.435Z","modified":"2026-11-05T15:37:47.734Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"FFmpeg","name":"FFmpeg","platforms":[],"versions":[{"version":"4.4","status":"affected","lessThanOrEqual":"9.0.2","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:github/ffmpeg/ffmpeg","cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-120246"}],"remediation":[],"references":["https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24856","https://github.com/FFmpeg/FFmpeg/commit/47313ad3f9f33b892384b976fb7c09b3c85fd74e","https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cdxl.c#L226-L229","https://github.com/FFmpeg/FFmpeg","https://www.vulncheck.com/advisories/ffmpeg-4.4-through-9.0.2-uninitialized-memory-disclosure-via-cdxl-ham-decoder"],"sources":[{"name":"CVE","id":"CVE-2026-120246","modified":"2026-11-05T15:37:47.734Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-120246"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.8},{"source":"VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","score":5.5}],"sourceAffected":[],"observedAt":"2026-11-05T16:30:36.102Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:25:31.038Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-01T02:00:39.598Z","attemptedAt":"2026-11-01T02:00:39.598Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-01T02:00:34.996Z","attemptedAt":"2026-11-01T02:00:34.996Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-11-01T02:00:34.969Z","attemptedAt":"2026-11-01T02:00:34.969Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-01T02:00:34.092Z","attemptedAt":"2026-11-01T02:00:34.092Z"}],"evidence":[{"source":"NVD","id":"CVE-2026-120246","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120246","modified":"2026-11-01T01:17:18.147","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-01T02:00:39.598Z"},{"source":"NVD","id":"CVE-2026-120246","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120246","modified":"2026-11-01T01:17:18.147","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","checkedAt":"2026-11-01T02:00:39.598Z"}],"aiSummary":{"text":"FFmpeg 4.4 through 9.0.2 has a use of uninitialized variable vulnerability in the CDXL decoder, leaking stack memory into decoded pixels. Attackers can craft a type-0 CDXL file to expose stack bytes and pointer fragments. The weakness is due to unfilled HAM palette entries in the CDXL HAM decoder.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-01T01:56:03.588Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-120246"}]}}