FKIE_CVE-2026-44905

Vulnerability from fkie_nvd - Published: 2026-05-26 22:16 - Updated: 2026-06-01 18:22
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0
security-advisories@github.comhttps://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-44905",
  "lastModified": "2026-06-01T18:22:32.550",
  "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": "2026-05-26T22:16:43.150",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-248"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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