{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119196", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-29T16:04:48.728Z", "datePublished": "2026-10-29T19:44:46.031Z", "dateUpdated": "2026-10-29T19:44:46.031Z"}, "containers": {"cna": {"title": "pyasn1: Quadratic CPU consumption in constructed BIT STRING 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-2qm8-x737-gmw5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-2qm8-x737-gmw5"}, {"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/73ba7b043cc7e92cb37f16f2c955bff93b0e6f6c", "tags": ["x_refsource_MISC"], "url": "https://github.com/pyasn1/pyasn1/commit/73ba7b043cc7e92cb37f16f2c955bff93b0e6f6c"}, {"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": "2026-10-29T19:44:46.031Z"}, "descriptions": [{"lang": "en", "value": "pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed BIT STRING decoding repeatedly shifts and copies the complete bit value accumulated from earlier fragments. Attacker-controlled BER or CER input contains many constructed BIT STRING fragments; schema-driven DER also accepts a definite-length constructed BIT STRING. BitStringPayloadDecoder repeatedly calls BitString.fromOctetString with the prior bitString as prepend, shifting an ever-growing SizedInteger for each fragment and causing quadratic work. Large fragmented values can exhaust CPU during decode() without requiring later conversion or formatting. This issue is fixed in version 0.6.5."}], "source": {"advisory": "GHSA-2qm8-x737-gmw5", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "pyasn1", "vendor": "pyasn1", "versions": [{"status": "affected", "version": "< 0.6.5"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed BIT STRING decoding repeatedly shifts and copies the complete bit value accumulated from earlier fragments. Attacker-controlled BER or CER input contains many constructed BIT STRING fragments; schema-driven DER also accepts a definite-length constructed BIT STRING. BitStringPayloadDecoder repeatedly calls BitString.fromOctetString with the prior bitString as prepend, shifting an ever-growing SizedInteger for each fragment and causing quadratic work. Large fragmented values can exhaust CPU during decode() without requiring later conversion or formatting. This issue is fixed in version 0.6.5."}], "id": "CVE-2026-119196", "lastModified": "2026-10-29T20:17:30.770", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-29T20:17:30.770", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pyasn1/pyasn1/commit/73ba7b043cc7e92cb37f16f2c955bff93b0e6f6c"}, {"source": "security-advisories@github.com", "url": "https://github.com/pyasn1/pyasn1/pull/132"}, {"source": "security-advisories@github.com", "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.5"}, {"source": "security-advisories@github.com", "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-2qm8-x737-gmw5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.6.5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pyasn1", "source": "cna", "vendor": "pyasn1"}, "product": "pyasn1", "vendor": "pyasn1"}], "created": "2026-10-29T20:30:18.007646+00:00", "updated": "2026-10-29T20:30:18.007682+00:00", "vendors": ["pyasn1", "pyasn1$PRODUCT$pyasn1"]}