{"id":"CVE-2026-44983","state":"PUBLISHED","title":"smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow","description":"smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1.","publishedAt":"2026-05-26T21:38:13.753Z","updatedAt":"2026-05-27T12:45:15.497Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["servo smallbitvec"],"affected":[{"vendor":"servo","product":"smallbitvec","versions":[{"version":">= 1.0.1, < 2.6.1","status":"affected"}]}],"references":["https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr"],"weaknesses":["CWE-122","CWE-190"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44983.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44983","state":"PUBLISHED","datePublished":"2026-05-26T21:38:13.753Z","dateUpdated":"2026-05-27T12:45:15.497Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-08T16:23:33.264Z"},"containers":{"cna":{"title":"smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow","descriptions":[{"lang":"en","value":"smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1."}],"affected":[{"vendor":"servo","product":"smallbitvec","versions":[{"version":">= 1.0.1, < 2.6.1","status":"affected"}]}],"references":[{"url":"https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr","name":"https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-26T21:38:13.753Z"},"source":{"advisory":"GHSA-97wc-2hqc-cjgr","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/servo/smallbitvec/security/advisories/GHSA-97wc-2hqc-cjgr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-27T12:45:06.921929Z","id":"CVE-2026-44983","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":"2026-05-27T12:45:15.497Z"}}]}}}