{"id":"CVE-2026-109425","state":"PUBLISHED","title":"Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets","description":"Tink-go (tink-crypto/tink-go) through 2.8.0 contains an input-validation vulnerability where keyset.NewHandleWithNoSecrets() and ReadWithNoSecrets() skip the structural Validate() step before constructing a keyset.Handle, allowing malformed public or no-secret keysets that violate Tink's keyset invariants to be accepted. Attackers can supply a malformed keyset, such as one with an enabled public key lacking a valid primary key or a DESTROYED key with no KeyData, causing inconsistent downstream validation where functions like jwt.JWKSetFromPublicKeysetHandle() process the invalid handle and produce a JWK set, potentially misleading applications that rely on successful handle construction as proof of keyset integrity.","publishedAt":"2026-10-12T19:55:37.215Z","updatedAt":"2026-10-27T01:30:42.123Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["tink-crypto tink-go"],"affected":[{"vendor":"tink-crypto","product":"tink-go","packageURL":"pkg:github/tink-crypto/tink-go","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.8.0","versionType":"semver"}],"repo":"https://github.com/tink-crypto/tink-go"}],"references":["https://github.com/tink-crypto/tink-go/issues/68","https://www.vulncheck.com/advisories/tink-go-keyset-validation-bypass-via-newhandlewithnosecrets"],"weaknesses":["CWE-1286"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109425.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109425","state":"PUBLISHED","datePublished":"2026-10-12T19:55:37.215Z","dateUpdated":"2026-10-27T01:30:42.123Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-12T15:52:36.681Z"},"containers":{"cna":{"title":"Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets","descriptions":[{"lang":"en","value":"Tink-go (tink-crypto/tink-go) through 2.8.0 contains an input-validation vulnerability where keyset.NewHandleWithNoSecrets() and ReadWithNoSecrets() skip the structural Validate() step before constructing a keyset.Handle, allowing malformed public or no-secret keysets that violate Tink's keyset invariants to be accepted. Attackers can supply a malformed keyset, such as one with an enabled public key lacking a valid primary key or a DESTROYED key with no KeyData, causing inconsistent downstream validation where functions like jwt.JWKSetFromPublicKeysetHandle() process the invalid handle and produce a JWK set, potentially misleading applications that rely on successful handle construction as proof of keyset integrity."}],"affected":[{"vendor":"tink-crypto","product":"tink-go","packageURL":"pkg:github/tink-crypto/tink-go","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThanOrEqual":"2.8.0","versionType":"semver"}],"repo":"https://github.com/tink-crypto/tink-go"}],"references":[{"url":"https://github.com/tink-crypto/tink-go/issues/68","name":"Researcher Disclosure","tags":["technical-description","exploit"]},{"url":"https://www.vulncheck.com/advisories/tink-go-keyset-validation-bypass-via-newhandlewithnosecrets","name":"VulnCheck Advisory: Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1286","lang":"en","description":"Improper Validation of Syntactic Correctness of Input","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-27T01:30:42.123Z"},"tags":["x_open-source"],"datePublic":"2026-09-10T00:00:00.000Z","credits":[{"lang":"en","value":"CayCon","type":"finder"},{"lang":"en","value":"PhuocDT","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:google:tink_go:*:*:*:*:*:*:*:*","versionStartIncluding":"2.0.0","versionEndIncluding":"2.8.0"}]}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T15:03:37.680199Z","id":"CVE-2026-109425","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T16:52:52.839Z"}}]}}}