Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets

{
  "id": "48e4efca44e439418f6735afb443e32cbf37d5a9e2b1efc136fde13c91f47485",
  "url": "https://osv.dev/vulnerability/CVE-2026-109425",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets",
    "summary": "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.",
    "evidence": "osv:CVE-2026-109425",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-109425",
      "aliases": [
        "CVE-2026-109425"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tink-crypto/tink-go",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e4efe8dadfb70cc4bad49c2f5a774e6783e0a251"
                },
                {
                  "last_affected": "ea8714348155f8b04002b633a790f41d58539672"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.8.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.8.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.8.0",
            "v2.7.0",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109425.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.298738015Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109425.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-109425",
        "https://www.vulncheck.com/advisories/tink-go-keyset-validation-bypass-via-newhandlewithnosecrets",
        "https://github.com/tink-crypto/tink-go",
        "https://github.com/tink-crypto/tink-go/issues/68"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1286"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109425.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-109425",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514404,
  "published_at": "2026-10-12T19:55:37.215+00:00"
}