{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-125203 in the wild and no public exploit code.","exposure":"","fix":"No fix has been published for CVE-2026-125203 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-125203 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-125203 and fix it if it is affected.\n\nWhat it is: CVE-2026-125203 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-125203 in the wild and no public exploit code.\n\nAffected product: FFmpeg. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-125203/ (Markdown: https://insights.sbomify.com/CVE-2026-125203/index.md)","id":"CVE-2026-125203","markdown":"https://insights.sbomify.com/CVE-2026-125203/index.md","name":"CVE-2026-125203","record":{"aliases":["GHSA-gc9x-4w7v-3282","UBUNTU-CVE-2026-125203"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":8.5,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap buffer overflow vulnerability in the Cook multichannel decoder in libavcodec/cook.c that fails to verify subpacket channel masks are disjoint. Attackers can supply a crafted RealMedia Cook stream with overlapping subpacket masks, causing cook_decode_frame() to write decoded samples beyond allocated output planes in any application decoding the file.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow in Cook Multichannel Decoder","id":"CVE-2026-125203","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"FFmpeg through 9.0.2 Heap Buffer Overflow in libwebp Encoder Conditional Replenishment","id":"CVE-2026-125204"},"nickname":null,"packages":[],"prev":{"headline":"FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC VAAPI Tile Arrays","id":"CVE-2026-125202"},"products":["FFmpeg"],"published":"2026-11-09","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-11-10","vendors":["FFmpeg"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-125203/"}