{"answers":{"affected":"1 open source package ship an affected version, including libfmt.","exploited":"There is no known exploitation of OSV-2020-1851 in the wild and no public exploit code.","fix":"No fix has been published for OSV-2020-1851 yet. Limit exposure of the affected software until one is available.","what":"OSV-2020-1851 is a memory corruption vulnerability in libfmt, published on 26 Sep 2020."},"fix_prompt":"Check this codebase for OSV-2020-1851 and fix it if it is affected.\n\nWhat it is: OSV-2020-1851 is a memory corruption vulnerability in libfmt, published on 26 Sep 2020. \nExploitation: There is no known exploitation of OSV-2020-1851 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- libfmt (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-2020-1851/ (Markdown: https://insights.sbomify.com/OSV-2020-1851/index.md)","id":"OSV-2020-1851","markdown":"https://insights.sbomify.com/OSV-2020-1851/index.md","name":"OSV-2020-1851","record":{"aliases":[],"analysis":{"component_type":"library","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"unknown","non_default_config":false,"product_category":"C++ formatting library","requires_auth":"unknown","summary":"A stack-buffer-underflow in the fmt library can cause a crash, potentially leading to denial of service for applications using it.","user_interaction":"unknown","vuln_class":"memory_corruption"},"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=21794\n\n```\nCrash type: Stack-buffer-underflow READ 16\nCrash state:\nfmt::v6::basic_format_args\u003cfmt::v6::basic_format_context\u003cstd::__1::back_insert_i\nfmt::v6::basic_format_args\u003cfmt::v6::basic_format_context\u003cstd::__1::back_insert_i\nfmt::v6::basic_format_context\u003cstd::__1::back_insert_iterator\u003cfmt::v6::internal::\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":"Stack-buffer-underflow in fmt::v6::basic_format_args\u003cfmt::v6::basic_format_context\u003cstd::__1::back_insert_i","id":"OSV-2020-1851","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"OSS-Fuzz","product":null,"products":[],"type":"memory_corruption","year":"2020"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"OSS-Fuzz","fixed":[],"introduced":[],"last_affected":[],"package":"libfmt","purl":"pkg:generic/libfmt","source":"OSV-2020-1851"}],"products":null,"published":"2020-09-26","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 stack-buffer-underflow in the fmt library can cause a crash, potentially leading to denial of service for applications using it.","url":"https://insights.sbomify.com/OSV-2020-1851/"}