{"id":"CVE-2026-54899","state":"PUBLISHED","title":"Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle","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.","publishedAt":"2026-06-30T23:03:15.696Z","updatedAt":"2026-07-01T14:26:28.538Z","severity":{"score":6.3,"label":"Medium","version":"4.0","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","source":"GitHub_M"},"assigner":"GitHub_M","products":["ohler55 oj"],"affected":[{"vendor":"ohler55","product":"oj","versions":[{"version":"< 3.17.2","status":"affected"}]}],"references":["https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54899.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54899","state":"PUBLISHED","datePublished":"2026-06-30T23:03:15.696Z","dateUpdated":"2026-07-01T14:26:28.538Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T13:49:33.555Z"},"containers":{"cna":{"title":"Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"ohler55","product":"oj","versions":[{"version":"< 3.17.2","status":"affected"}]}],"references":[{"url":"https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r","name":"https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","description":"CWE-416: Use After Free","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-30T23:03:15.696Z"},"source":{"advisory":"GHSA-2cw7-v8ff-p88r","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-01T13:38:09.223016Z","id":"CVE-2026-54899","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-01T14:26:28.538Z"}}]}}}