{"id":"CVE-2026-44905","summary":"Vanetza: Remote Denial of Service via Uncaught OER Encoding Exception in Cryptographic Verification","details":"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.","aliases":["GHSA-q9fq-3rx9-7xcv"],"modified":"2026-10-28T11:10:55.862143718Z","published":"2026-05-26T21:18:33.445Z","database_specific":{"cwe_ids":["CWE-248"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44905.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44905.json"},{"type":"ADVISORY","url":"https://github.com/riebl/vanetza/security/advisories/GHSA-q9fq-3rx9-7xcv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44905"},{"type":"FIX","url":"https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/riebl/vanetza","events":[{"introduced":"0"},{"fixed":"e1a2e2709210d309458c3d77f98d50dec26c0df0"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"0"},{"fixed":"e1a2e2709210d309458c3d77f98d50dec26c0df0"}],"source":"AFFECTED_FIELD"},{"range":[{"introduced":"0"},{"last_affected":"26.02"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"e1a2e2709210d309458c3d77f98d50dec26c0df0"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["v26.02","v25.06","v24.10"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44905.json","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0","target":{"file":"vanetza/security/straight_verify_service.cpp"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["169467805809650100907254097227535752772","14041500191709272601141769165788347043","200498007955823437206347493676005167514","303546908535609357706725288682390875012","222431100608473746886292800090134048161","58442767986675785543773197795781573982","318994315303756853649180777306688923296"]},"id":"CVE-2026-44905-61e6ee49"},{"signature_type":"Function","signature_version":"v1","source":"https://github.com/riebl/vanetza/commit/e1a2e2709210d309458c3d77f98d50dec26c0df0","target":{"function":"StraightVerifyService::verify","file":"vanetza/security/straight_verify_service.cpp"},"deprecated":false,"digest":{"length":4405,"function_hash":"216969328075873767355756843707141070872"},"id":"CVE-2026-44905-fe516727"}],"vanir_signatures_modified":"2026-10-28T11:10:55Z"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}