{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-24240 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2020-24240 is a medium-severity use after free vulnerability in n/a, published on 25 Aug 2020. 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-2020-24240 and fix it if it is affected.\n\nWhat it is: CVE-2020-24240 is a medium-severity use after free vulnerability in n/a, published on 25 Aug 2020. 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-2020-24240 in the wild and no public exploit code.\n\nAffected product: n/a. 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-2020-24240/ (Markdown: https://insights.sbomify.com/CVE-2020-24240/index.md)","id":"CVE-2020-24240","markdown":"https://insights.sbomify.com/CVE-2020-24240/index.md","name":"CVE-2020-24240","record":{"aliases":["ALPINE-CVE-2020-24240","CVE-2020-16132","DEBIAN-CVE-2020-24240","GHSA-5xv5-wxfg-845r","OESA-2022-1767","UBUNTU-CVE-2020-24240"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"GNU Bison parser generator","requires_auth":"none","summary":"A use-after-free vulnerability in GNU Bison allows attackers to cause a denial of service via crafted input containing null bytes.","user_interaction":"required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"bison","vendor":"gnu"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"GNU Bison before 3.7.1 has a use-after-free in _obstack_free in lib/obstack.c (called from gram_lex) when a '\\0' byte is encountered. NOTE: there is a risk only if Bison is used with untrusted input, and the observed bug happens to cause unsafe behavior with a specific compiler/architecture. The bug report was intended to show that a crash may occur in Bison itself, not that a crash may occur in code that is generated by Bison.","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 n/a","id":"CVE-2020-24240","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2020"},"n_packages":0,"n_references":3,"next":{"headline":"Use after free in n/a","id":"CVE-2020-24241"},"packages":[],"prev":{"headline":"Missing authorization in n/a","id":"CVE-2020-24231"},"products":["n/a"],"published":"2020-08-25","related":[{"cvss_score":6.8,"headline":"Arbitrary Command Execution in GNU Bison","id":"CVE-2026-56389","kev_date_added":null,"published":"2026-07-29"},{"cvss_score":5.5,"headline":"Denial of service in n/a","id":"CVE-2020-14150","kev_date_added":null,"published":"2020-06-15"},{"cvss_score":4.6,"headline":"Arbitrary Output Location Change in GNU Bison","id":"CVE-2026-56390","kev_date_added":null,"published":"2026-07-29"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"A use-after-free vulnerability in GNU Bison allows attackers to cause a denial of service via crafted input containing null bytes.","url":"https://insights.sbomify.com/CVE-2020-24240/"}