{"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-2026-54899 exists.","fix":"Upgrade oj to 3.17.2 or later.","what":"CVE-2026-54899 is a medium-severity use after free vulnerability in ohler55 oj, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-54899 and fix it if it is affected.\n\nWhat it is: CVE-2026-54899 is a medium-severity use after free vulnerability in ohler55 oj, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54899 exists.\n\nAffected packages and fixed versions:\n- oj (RubyGems): affected all versions; fixed in 3.17.2\n- oj (RubyGems): affected all versions; fixed in 3.17.2\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-2026-54899/ (Markdown: https://insights.sbomify.com/CVE-2026-54899/index.md)","id":"CVE-2026-54899","markdown":"https://insights.sbomify.com/CVE-2026-54899/index.md","name":"CVE-2026-54899","record":{"aliases":["DEBIAN-CVE-2026-54899","GHSA-2cw7-v8ff-p88r","MINI-2pg7-5c55-2xfc","MINI-3976-3wf6-x2jj","MINI-53jm-38p8-cr98","MINI-695p-3hf6-jh82","MINI-76x7-9x9p-f8x4","MINI-9vg2-rh96-qjh2","MINI-fmx2-fhm7-9g3r","MINI-p9pw-339c-8qv6","MINI-rj24-cj8v-f4vm","MINI-rp98-jr3q-wxxp","UBUNTU-CVE-2026-54899"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Ruby JSON parser","requires_auth":"none","summary":"A use-after-free vulnerability in the Oj Ruby gem allows attackers to cause crashes or execute code by toggling symbol keys on a reused parser instance.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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. Prior to version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing 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 Symbol Key Cache Toggle","id":"CVE-2026-54899","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: Negative-Size memcpy in Oj::Parser create_id Attribute Handling","id":"CVE-2026-54900"},"packages":[{"ecosystem":"RubyGems","fixed":["3.17.2"],"introduced":["0"],"last_affected":[],"package":"oj","purl":null,"source":"GHSA-2cw7-v8ff-p88r"},{"ecosystem":"RubyGems","fixed":["3.17.2"],"introduced":["0"],"last_affected":[],"package":"oj","purl":"pkg:gem/oj","source":"GHSA-2cw7-v8ff-p88r"}],"prev":{"headline":"Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation","id":"CVE-2026-54898"},"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 cause crashes or execute code by toggling symbol keys on a reused parser instance.","url":"https://insights.sbomify.com/CVE-2026-54899/"}