{"id":"CVE-2026-33524","state":"PUBLISHED","title":"Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization","description":"Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.","publishedAt":"2026-04-24T18:18:02.913Z","updatedAt":"2026-04-27T13:35:28.660Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["ndsev zserio"],"affected":[{"vendor":"ndsev","product":"zserio","versions":[{"version":"< 2.18.1","status":"affected"}]}],"references":["https://github.com/ndsev/zserio/security/advisories/GHSA-cwq5-8pvq-j65j"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33524.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33524","state":"PUBLISHED","datePublished":"2026-04-24T18:18:02.913Z","dateUpdated":"2026-04-27T13:35:28.660Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-20T18:05:11.829Z"},"containers":{"cna":{"title":"Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization","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, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1."}],"affected":[{"vendor":"ndsev","product":"zserio","versions":[{"version":"< 2.18.1","status":"affected"}]}],"references":[{"url":"https://github.com/ndsev/zserio/security/advisories/GHSA-cwq5-8pvq-j65j","name":"https://github.com/ndsev/zserio/security/advisories/GHSA-cwq5-8pvq-j65j","tags":["x_refsource_CONFIRM"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-24T18:18:02.913Z"},"source":{"advisory":"GHSA-cwq5-8pvq-j65j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-27T13:20:21.391216Z","id":"CVE-2026-33524","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-27T13:35:28.660Z"}}]}}}