{"id":"JLSEC-2026-1184","summary":"FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability...","details":"FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows attackers to expose uninitialized heap memory by supplying a valid zlib stream that inflates to fewer bytes than the expected frame size. The `zlib_decomp()` function in lcldec.c treats short decompression as non-fatal and continues to the RGB24 conversion path, which copies a full frame's worth of rows from the allocation buffer using original frame dimensions, causing uninitialized heap contents including pointer-derived allocator bytes to be copied into the attacker-observable AVFrame output and potentially defeating ASLR in long-lived media processing services.","modified":"2026-08-08T23:15:05.715595723Z","published":"2026-08-07T13:27:45.313Z","upstream":["CVE-2026-66038","GHSA-8mx4-8xfc-qr43","EUVD-2026-48740"],"database_specific":{"license":"CC-BY-4.0","sources":[{"database_specific":{"status":"Analyzed"},"id":"CVE-2026-66038","imported":"2026-08-08T05:24:16.227Z","modified":"2026-08-07T00:54:32.767Z","published":"2026-07-24T20:18:20.727Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-66038","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66038"},{"modified":"2026-07-24T21:32:28Z","published":"2026-07-24T21:32:22Z","url":"https://api.github.com/advisories/GHSA-8mx4-8xfc-qr43","html_url":"https://github.com/advisories/GHSA-8mx4-8xfc-qr43","id":"GHSA-8mx4-8xfc-qr43","imported":"2026-08-08T05:25:33.124Z"},{"published":"2026-07-24T19:39:27Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-48740","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-48740","id":"EUVD-2026-48740","imported":"2026-08-08T05:24:18.382Z","modified":"2026-07-28T01:06:28Z"}]},"references":[{"type":"WEB","url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/e7cbfd1c507b57a806a5825b87d609963e862c8c"},{"type":"WEB","url":"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23626"},{"type":"WEB","url":"https://github.com/advisories/GHSA-8mx4-8xfc-qr43"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66038"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/ffmpeg-lcl-zlib-video-decoder-information-disclosure-via-lcldec-c"}],"affected":[{"package":{"name":"FFMPEG_jll","ecosystem":"Julia","purl":"pkg:julia/FFMPEG_jll?uuid=b22a6f82-2f65-5046-a5b2-351ab43fb4e5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"9.0.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1184.json"}},{"package":{"name":"FFMPEG_nogpl_jll","ecosystem":"Julia","purl":"pkg:julia/FFMPEG_nogpl_jll?uuid=a6892c6b-5768-548c-b024-ff8dabf482c5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"9.0.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1184.json"}},{"package":{"name":"FFplay_jll","ecosystem":"Julia","purl":"pkg:julia/FFplay_jll?uuid=c4dce911-e170-5107-8314-c7bdc6785395"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"9.0.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1184.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/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"}]}