{"answers":{"affected":"1 open source package ship an affected version, including c-blosc2.","exploited":"There is no known exploitation of OSV-2021-1645 in the wild and no public exploit code.","fix":"No fix has been published for OSV-2021-1645 yet. Limit exposure of the affected software until one is available.","what":"OSV-2021-1645 is a memory corruption vulnerability in c-blosc2, published on 4 Dec 2021."},"fix_prompt":"Check this codebase for OSV-2021-1645 and fix it if it is affected.\n\nWhat it is: OSV-2021-1645 is a memory corruption vulnerability in c-blosc2, published on 4 Dec 2021. \nExploitation: There is no known exploitation of OSV-2021-1645 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- c-blosc2 (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-2021-1645/ (Markdown: https://insights.sbomify.com/OSV-2021-1645/index.md)","id":"OSV-2021-1645","markdown":"https://insights.sbomify.com/OSV-2021-1645/index.md","name":"OSV-2021-1645","record":{"aliases":[],"analysis":{"component_type":"library","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"unknown","non_default_config":false,"product_category":"Blosc compression library","requires_auth":"none","summary":"An unknown read error in the ndlz4_decompress function of the Blosc library can cause a crash, potentially leading to denial of service.","user_interaction":"not_required","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=41636\n\n```\nCrash type: UNKNOWN READ\nCrash state:\nndlz4_decompress\nblosc_d\ndo_job\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":"UNKNOWN READ in ndlz4_decompress","id":"OSV-2021-1645","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"OSS-Fuzz","product":null,"products":[],"type":"memory_corruption","year":"2021"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"OSS-Fuzz","fixed":[],"introduced":[],"last_affected":[],"package":"c-blosc2","purl":"pkg:generic/c-blosc2","source":"OSV-2021-1645"}],"products":null,"published":"2021-12-04","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":"An unknown read error in the ndlz4_decompress function of the Blosc library can cause a crash, potentially leading to denial of service.","url":"https://insights.sbomify.com/OSV-2021-1645/"}