{"answers":{"affected":"1 open source package ship an affected version, including openh264.","exploited":"There is no known exploitation of OSV-2020-503 in the wild and no public exploit code.","fix":"No fix has been published for OSV-2020-503 yet. Limit exposure of the affected software until one is available.","what":"OSV-2020-503 is an use after free vulnerability in openh264, published on 1 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for OSV-2020-503 and fix it if it is affected.\n\nWhat it is: OSV-2020-503 is an use after free vulnerability in openh264, published on 1 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of OSV-2020-503 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- openh264 (OSS-Fuzz): affected all versions; no fix listed\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/OSV-2020-503/ (Markdown: https://insights.sbomify.com/OSV-2020-503/index.md)","id":"OSV-2020-503","markdown":"https://insights.sbomify.com/OSV-2020-503/index.md","name":"OSV-2020-503","record":{"aliases":[],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenH264 decoder library","requires_auth":"none","summary":"A heap-use-after-free vulnerability in the OpenH264 decoder allows attackers to execute arbitrary code or cause denial of service via crafted media files.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18438\n\n```\nCrash type: Heap-use-after-free WRITE 1\nCrash state:\nWelsDec::SetUnRef\nWelsDec::WelsResetRefPic\nWelsFreeDynamicMemory\n```","ecosystems":["OSS-Fuzz"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Heap-use-after-free in WelsDec::SetUnRef","id":"OSV-2020-503","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"OSS-Fuzz","product":null,"products":[],"type":"use_after_free","year":"2020"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"OSS-Fuzz","fixed":[],"introduced":[],"last_affected":[],"package":"openh264","purl":"pkg:generic/openh264","source":"OSV-2020-503"}],"products":null,"published":"2020-07-01","related":[],"sources":[{"class":"attribution","licence":"CC BY 4.0","name":"OSS-Fuzz","prefix":"OSV"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":"A heap-use-after-free vulnerability in the OpenH264 decoder allows attackers to execute arbitrary code or cause denial of service via crafted media files.","url":"https://insights.sbomify.com/OSV-2020-503/"}