Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification_CVE-2026-44905

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-05-26T21:18:33.445Z",
    "modified": "2026-05-26T21:18:33.445Z",
    "type": "cve",
    "title": "Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification",
    "source": "GitHub_M",
    "references": "https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv\nhttps://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0",
    "id": "CVE-2026-44905",
    "bulletinFamily": "",
    "cwe": [
        "CWE-248"
    ],
    "cvelist": null,
    "sourceData": "riebl vanetza < e1a2e2709210d309458c3d77f98d50dec26c0df0\nriebl vanetza <= 26.02",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "vanetza",
    "version": "< e1a2e2709210d309458c3d77f98d50dec26c0df0",
    "vendor": "riebl",
    "ai_description": "",
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    "ai_score": 0
}