Vulnerability in Tink-Crypto Tink-Go
CVE-2026-109425
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/tink-crypto/tink-go/issues/68 (technical-description, exploit)
- www.vulncheck.com/advisories/tink-go-keyset-validation-bypass-via-newhandlewith… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109425?
- CVE-2026-109425 is a medium-severity vulnerability in Tink-Crypto Tink-Go, classified under CWE-1286. CVSS score: 5.3/10. Published 2026-10-12.
- How severe is CVE-2026-109425?
- Medium severity. CVSS v3 base score is 5.3 out of 10.