{"id":"CVE-2026-16516","revision":null,"records":[{"revision":"ff3f500bd9e24f49be3ba01fc47abb0a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-16516","aliases":[],"title":"wolfSSH ECDSA host key curve not validated against negotiated algorithm","description":"wolfSSH does not validate that the ECDSA curve identifier in a KEXDH_REPLY host key blob matches the algorithm negotiated during key exchange. In ParseECCPubKey() (src/internal.c), the blob's algorithm string is used to derive the curve via NameToId/wcPrimeForId without checking against the negotiated ssh->handshake->pubKeyId, and the RFC 5656 curve identifier string is discarded via GetSkip() rather than compared. An active network man-in-the-middle attacker can substitute a host key blob containing a different ECDSA curve, causing the client to import the key on the wrong curve. Because the attacker controls the private key for the substituted curve, signature verification passes. Exploitation requires an active MitM position and a lax public key check callback (e.g., TOFU, algorithm-name-only check, or fingerprint match against the parsed key).","state":0,"publishedAt":"2026-10-07T02:38:23.334+00:00","modifiedAt":"2026-10-07T11:17:14.029+00:00","affected":[{"ecosystem":"Vendor product","name":"wolfSSH","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"wolfSSL Inc.\",\n                    \"product\": \"wolfSSH\",\n                    \"repo\": \"https://github.com/wolfSSL/wolfssh\",\n                    \"programFiles\": [\n                        \"src/internal.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"1.5.0\",\n                            \"changes\": [\n                                {\n                                    \"at\": \"1.6.0\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N","score":9,"severity":"CRITICAL"}],"references":["https://github.com/wolfSSL/wolfssh/issues/1012","https://github.com/wolfSSL/wolfssh/commit/31d13697a608fa1bf9eec11aa6eff1503ade836f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-16516","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-16516","identifiers":["CVE-2026-16516"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-46ce9a3d9e614d97967fa637fa305687","complete":false,"records":13759,"lastAttemptAt":"2026-11-11T13:01:27.9397485+00:00","lastSuccessAt":"2026-11-11T13:01:28.001291+00:00","error":null,"lastVerifiedAt":"2026-11-11T13:01:28.001291+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T13:00:02.7707579+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T13:00:02.7707579+00:00","lastSuccessAt":"2026-11-11T13:00:02.9567134+00:00","error":null,"lastVerifiedAt":"2026-11-11T13:00:02.9567135+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-a879d9d6add14faf90d52773703368be","complete":true,"records":13753,"lastAttemptAt":"2026-11-11T13:00:06.155482+00:00","lastSuccessAt":"2026-11-11T13:00:06.151+00:00","error":null,"lastVerifiedAt":"2026-11-11T13:00:06.151+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13813,"expectedIdentifiers":13813,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T12:59:57.6350799+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T12:59:57.6350799+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T12:57:49.1672871+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T12:57:49.1672871+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-baa8362b4daf9e5f39d5563775a55935e7b442c0735d33274a921579ce4a0d66","complete":true,"records":3093,"lastAttemptAt":"2026-11-11T13:00:02.7256916+00:00","lastSuccessAt":"2026-11-11T13:00:02.5446881+00:00","error":null,"lastVerifiedAt":"2026-11-11T13:00:02.7256916+00:00","snapshotPublishedAt":"2026-11-11T12:47:47+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-10cb353ca77c2a8069d6892d1d394d936b12c0add3c8749e2a1a03a1c5d50426","complete":true,"records":231666,"lastAttemptAt":"2026-11-11T12:59:57.5030871+00:00","lastSuccessAt":"2026-11-11T12:59:55.8981437+00:00","error":null,"lastVerifiedAt":"2026-11-11T12:59:57.5030871+00:00","snapshotPublishedAt":"2026-11-11T12:32:53+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}