{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-44905",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-07T21:50:33.547Z",
        "datePublished": "2026-05-26T21:18:33.445Z",
        "dateUpdated": "2026-05-27T13:01:57.541Z"
    },
    "containers": {
        "cna": {
            "title": "Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-248",
                            "lang": "en",
                            "description": "CWE-248: Uncaught Exception",
                            "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/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv"
                },
                {
                    "name": "https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0"
                }
            ],
            "affected": [
                {
                    "vendor": "riebl",
                    "product": "vanetza",
                    "versions": [
                        {
                            "version": "< e1a2e2709210d309458c3d77f98d50dec26c0df0",
                            "status": "affected"
                        },
                        {
                            "version": "<= 26.02",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-05-26T21:18:33.445Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Vanetza is an open-source implementation of the ETSI C-ITS protocol suite. In 26.02 and earlier, a denial-of-service vulnerability was identified in the cryptographic verification pipeline of Vanetza. When processing incoming V2X messages, the ASN.1 decoder accepts the structure as syntactically valid. However, this reveals a logic-based protocol failure where semantic constraints on specific fields are only strictly enforced during OER re-encoding. Specifically, if a crafted packet contains a certificate where the Psid (Provider Service Identifier) sub-type violates subtype constraints (e.g., out-of-range or invalid CHOICE variant), it is accepted during initial parsing, where subtype constraints are not enforced. Later, when StraightVerifyService attempts to calculate a message hash for cryptographic verification, it must re-encode the signing certificate. The underlying ASN.1 wrapper (asn1c_wrapper.cpp) detects the semantic violation during encoding and raises a std::runtime_error. This exception is not caught within the encoding path and propagates to std::terminate, resulting in immediate process termination. This vulnerability is fixed with commit e1a2e2709210d309458c3d77f98d50dec26c0df0."
                }
            ],
            "source": {
                "advisory": "GHSA-q9fq-3rx9-7xcv",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-27T13:01:15.575636Z",
                                "id": "CVE-2026-44905",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "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": "2026-05-27T13:01:57.541Z"
                }
            }
        ]
    }
}