{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119195", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-29T16:04:48.728Z", "datePublished": "2026-10-29T19:41:37.352Z", "dateUpdated": "2026-10-29T19:41:37.352Z"}, "containers": {"cna": {"title": "pyasn1: Quadratic-time denial of service in constructed string and indefinite-length ANY decoding", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "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-9m75-vc3g-4x39", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-9m75-vc3g-4x39"}, {"name": "https://github.com/pyasn1/pyasn1/pull/132", "tags": ["x_refsource_MISC"], "url": "https://github.com/pyasn1/pyasn1/pull/132"}, {"name": "https://github.com/pyasn1/pyasn1/commit/4ce00797c594b59c1fd6b86d9ebc3ba87b7ec9f9", "tags": ["x_refsource_MISC"], "url": "https://github.com/pyasn1/pyasn1/commit/4ce00797c594b59c1fd6b86d9ebc3ba87b7ec9f9"}, {"name": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5"}], "affected": [{"vendor": "pyasn1", "product": "pyasn1", "versions": [{"version": "< 0.6.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-29T19:41:37.352Z"}, "descriptions": [{"lang": "en", "value": "pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed string and indefinite-length ANY decoding repeatedly concatenates each fragment onto a growing bytes value. Attacker-controlled BER or CER data can use many constructed OCTET STRING or character-string fragments. DER rejects constructed OCTET STRING without a schema, but accepts its definite-length form when asn1Spec selects univ.OctetString; it also accepts constructed character strings such as UTF8String without a schema, even though those encodings are not valid DER. The separate indefinite-length ANY path is reachable in BER and CER when asn1Spec selects univ.Any; DER rejects indefinite lengths. OctetStringPayloadDecoder uses growing header concatenation and AnyPayloadDecoder.indefLenValueDecoder uses growing chunk concatenation, repeatedly copying an increasing prefix and causing quadratic work. A sufficiently fragmented value can occupy decoding workers and cause CPU exhaustion without confidentiality or integrity impact. This issue is fixed in version 0.6.5."}], "source": {"advisory": "GHSA-9m75-vc3g-4x39", "discovery": "UNKNOWN"}}}}

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