Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-109425Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets
Medium 5.3
In plain English
A medium-severity security flaw in tink-go from tink-crypto. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | golang-github-tink-crypto-tink-go | no fix listed | DEBIAN-CVE-2026-109425 |
| Debian:14 | golang-github-tink-crypto-tink-go | no fix listed | DEBIAN-CVE-2026-109425 |
| Ubuntu:26.04:LTS | golang-github-tink-crypto-tink-go | no fix listed | UBUNTU-CVE-2026-109425 |
| Ubuntu:26.10 | golang-github-tink-crypto-tink-go | no fix listed | UBUNTU-CVE-2026-109425 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tink-crypto | tink-go | 2.0.0 – through 2.8.0 |
Weakness: CWE-1286 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- Researcher Disclosure technical-description, exploit
- VulnCheck Advisory: Tink-go 2.8.0 Keyset Validation Bypass via NewHandleWithNoSecrets third-party-advisory