{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33666","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-23T15:23:42.220Z","datePublished":"2026-04-24T18:21:11.265Z","dateUpdated":"2026-04-27T13:46:01.833Z"},"containers":{"cna":{"title":"Zserio: Integer Overflow in BitStreamReader on 32-bit platforms","problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj"}],"affected":[{"vendor":"ndsev","product":"zserio","versions":[{"version":"<= 2.15.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-24T18:21:11.265Z"},"descriptions":[{"lang":"en","value":"Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, in BitStreamReader.h readBytes() / readString(), the setBitPosition() bounds check receives the overflowed value and is completely bypassed. The code then reads len bytes (512 MB) from a buffer that is only a few bytes long, causing a segmentation fault. This vulnerability is fixed in 2.18.1."}],"source":{"advisory":"GHSA-fjwv-6wcr-vqwj","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/ndsev/zserio/security/advisories/GHSA-fjwv-6wcr-vqwj","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-27T13:45:58.519906Z","id":"CVE-2026-33666","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-27T13:46:01.833Z"}}]}}