{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-125209 in the wild and no public exploit code.","exposure":"","fix":"No fix has been published for CVE-2026-125209 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-125209 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-125209 and fix it if it is affected.\n\nWhat it is: CVE-2026-125209 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-125209 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-2026-125209/ (Markdown: https://insights.sbomify.com/CVE-2026-125209/index.md)","id":"CVE-2026-125209","markdown":"https://insights.sbomify.com/CVE-2026-125209/index.md","name":"CVE-2026-125209","record":{"aliases":["GHSA-w4mp-gp7g-4g8p","UBUNTU-CVE-2026-125209"],"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-131","name":"Incorrect Calculation of Buffer Size"}],"description":"FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap buffer overflow vulnerability in the DVD subtitle encoder that underestimates RLE output size for odd-width rectangles. Attackers can supply files with crafted bitmap subtitles that, when transcoded to the dvdsub encoder, write past the output buffer and corrupt heap memory.","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 via dvdsubenc.c","id":"CVE-2026-125209","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 Overflow in libaribcaption Text Subtitle Decoding","id":"CVE-2026-125210"},"nickname":null,"packages":[],"prev":{"headline":"FFmpeg through 9.0.2 V4L2 M2M Encoder Out-of-Bounds Write in v4l2_buffers.c","id":"CVE-2026-125208"},"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-09","vendors":["FFmpeg"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-125209/"}