{"id":"JLSEC-2026-1171","summary":"FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes...","details":"FFmpeg's RASC video decoder (`decode_dlta` in `libavcodec/rasc.c`) performs 32-bit reads and writes at the row cursor before the `NEXT_LINE` row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.","modified":"2026-08-09T01:45:04.116806770Z","published":"2026-08-07T13:27:45.313Z","upstream":["CVE-2026-58049","GHSA-mjxr-6gqf-w78h","EUVD-2026-39969"],"database_specific":{"sources":[{"imported":"2026-08-07T05:41:47.275Z","modified":"2026-07-31T13:18:45.483Z","published":"2026-06-28T02:16:30.477Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-58049","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58049","database_specific":{"status":"Awaiting Analysis"},"id":"CVE-2026-58049"},{"html_url":"https://github.com/advisories/GHSA-mjxr-6gqf-w78h","id":"GHSA-mjxr-6gqf-w78h","imported":"2026-08-07T05:41:53.583Z","modified":"2026-07-23T12:32:45Z","published":"2026-06-28T03:33:40Z","url":"https://api.github.com/advisories/GHSA-mjxr-6gqf-w78h"},{"imported":"2026-08-07T05:41:14.943Z","modified":"2026-07-31T12:04:42Z","published":"2026-06-28T01:32:52Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-39969","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-39969","id":"EUVD-2026-39969"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:43711"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-58049"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2493952"},{"type":"WEB","url":"https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c"},{"type":"WEB","url":"https://github.com/advisories/GHSA-mjxr-6gqf-w78h"},{"type":"WEB","url":"https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58049"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58049.json"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta"}],"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-2026-1171.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-2026-1171.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-2026-1171.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/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"}]}