{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-33641 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-33641 is a high-severity use after free vulnerability in byacc, published on 20 Jan 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-33641 and fix it if it is affected.\n\nWhat it is: CVE-2021-33641 is a high-severity use after free vulnerability in byacc, published on 20 Jan 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-33641 in the wild and no public exploit code.\n\nAffected product: byacc. 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-2021-33641/ (Markdown: https://insights.sbomify.com/CVE-2021-33641/index.md)","id":"CVE-2021-33641","markdown":"https://insights.sbomify.com/CVE-2021-33641/index.md","name":"CVE-2021-33641","record":{"aliases":["CLSA-2026-1782221814","GHSA-56c6-2pfc-9rvh"],"analysis":{"component_type":"developer_tool","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"byacc parser generator","requires_auth":"none","summary":"A use-after-free vulnerability in byacc allows attackers to potentially execute arbitrary code or cause a denial of service via crafted input files.","user_interaction":"required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openEuler","cpe":[{"product":"byacc","vendor":"openeuler"}],"cvss":{"score":7.8,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Use after free in byacc","id":"CVE-2021-33641","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in byacc","id":"CVE-2021-33642"},"packages":[],"prev":{"headline":"Use after free in openEuler 20.03 LTS SP1","id":"CVE-2021-33640"},"products":["byacc"],"published":"2023-01-20","related":[{"cvss_score":5.5,"headline":"Denial of service in byacc","id":"CVE-2021-33642","kev_date_added":null,"published":"2023-01-20"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"partial"},"state":"PUBLISHED","updated":"2025-04-03","vendors":["n/a"]},"summary":"A use-after-free vulnerability in byacc allows attackers to potentially execute arbitrary code or cause a denial of service via crafted input files.","url":"https://insights.sbomify.com/CVE-2021-33641/"}