{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-101918",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-09-28T15:55:37.908Z",
        "datePublished": "2026-09-28T20:11:55.278Z",
        "dateUpdated": "2026-09-28T20:11:55.278Z"
    },
    "containers": {
        "cna": {
            "title": "PyJWT: Unauthenticated RecursionError DoS in pre-verification payload parse (PyJWKClient.get_signing_key_from_jwt / verify_signature=False)",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-248",
                            "lang": "en",
                            "description": "CWE-248: Uncaught Exception",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "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:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-42vr-xj54-vc7v",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-42vr-xj54-vc7v"
                },
                {
                    "name": "https://github.com/jpadilla/pyjwt/commit/5fde08a6cf906aa7698de2d6391d88b73006b17b",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/jpadilla/pyjwt/commit/5fde08a6cf906aa7698de2d6391d88b73006b17b"
                },
                {
                    "name": "https://github.com/jpadilla/pyjwt/releases/tag/2.15.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/jpadilla/pyjwt/releases/tag/2.15.0"
                }
            ],
            "affected": [
                {
                    "vendor": "jpadilla",
                    "product": "pyjwt",
                    "versions": [
                        {
                            "version": ">= 2.0.0a1, < 2.15.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-28T20:11:55.278Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0."
                }
            ],
            "source": {
                "advisory": "GHSA-42vr-xj54-vc7v",
                "discovery": "UNKNOWN"
            }
        }
    }
}