{"answers":{"affected":"2 open source packages ship an affected version, including oj.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54898 exists.","fix":"Upgrade oj to 3.17.3 or later.","what":"CVE-2026-54898 is a low-severity use after free vulnerability in ohler55 oj, published on 30 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54898 and fix it if it is affected.\n\nWhat it is: CVE-2026-54898 is a low-severity use after free vulnerability in ohler55 oj, published on 30 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54898 exists.\n\nAffected packages and fixed versions:\n- oj (RubyGems): affected all versions; fixed in 3.17.3\n- oj (RubyGems): affected all versions; fixed in 3.17.3\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-2026-54898/ (Markdown: https://insights.sbomify.com/CVE-2026-54898/index.md)","id":"CVE-2026-54898","markdown":"https://insights.sbomify.com/CVE-2026-54898/index.md","name":"CVE-2026-54898","record":{"aliases":["DEBIAN-CVE-2026-54898","GHSA-q2gm-54r6-8fwm","MINI-3832-5v48-3724","MINI-82hq-3wfg-ww4q","MINI-8m6f-r894-q979","MINI-9v4w-m9qp-gj88","MINI-c98h-4j8x-7gf8","MINI-grwf-p35c-g75j","MINI-jrq8-c5r8-3926","MINI-jvwr-mvqr-g59c","MINI-m74x-vfw5-ffm8","MINI-vjj6-fr5r-r466","UBUNTU-CVE-2026-54898"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Ruby JSON parser","requires_auth":"none","summary":"A use-after-free vulnerability in the Oj Ruby gem allows attackers to execute arbitrary code or cause denial of service via crafted JSON input.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":2.1,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.","ecosystems":["RubyGems"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation","id":"CVE-2026-54898","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle","id":"CVE-2026-54899"},"packages":[{"ecosystem":"RubyGems","fixed":["3.17.3"],"introduced":["0"],"last_affected":[],"package":"oj","purl":null,"source":"GHSA-q2gm-54r6-8fwm"},{"ecosystem":"RubyGems","fixed":["3.17.3"],"introduced":["0"],"last_affected":[],"package":"oj","purl":"pkg:gem/oj","source":"GHSA-q2gm-54r6-8fwm"}],"prev":{"headline":"Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close","id":"CVE-2026-54897"},"products":["oj"],"published":"2026-06-30","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-01","vendors":["ohler55"]},"summary":"A use-after-free vulnerability in the Oj Ruby gem allows attackers to execute arbitrary code or cause denial of service via crafted JSON input.","url":"https://insights.sbomify.com/CVE-2026-54898/"}