{
    "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"
            }
        }
    }
}