{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59884","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-07T16:40:07.982Z","datePublished":"2026-07-14T16:41:10.277Z","dateUpdated":"2026-07-15T13:50:29.814Z"},"containers":{"cna":{"title":"pyasn1 BER/CER/DER decoder denial of service via unbounded long-form tag IDs","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","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/pyasn1/pyasn1/security/advisories/GHSA-m4p7-r5rc-7g4j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-m4p7-r5rc-7g4j"},{"name":"https://github.com/pyasn1/pyasn1/commit/628e36ecbb5277a3f01572ce418ef54271b165a5","tags":["x_refsource_MISC"],"url":"https://github.com/pyasn1/pyasn1/commit/628e36ecbb5277a3f01572ce418ef54271b165a5"},{"name":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4","tags":["x_refsource_MISC"],"url":"https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4"}],"affected":[{"vendor":"pyasn1","product":"pyasn1","versions":[{"version":"< 0.6.4","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-14T16:41:10.277Z"},"descriptions":[{"lang":"en","value":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is fixed in version 0.6.4."}],"source":{"advisory":"GHSA-m4p7-r5rc-7g4j","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T13:50:17.314569Z","id":"CVE-2026-59884","options":[{"Exploitation":"none"},{"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":"2026-07-15T13:50:29.814Z"}}]}}