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TI-2026-71269 Aliases CVE-2026-109425GHSA-5fgm-q74f-6j8f

Keyset validation bypass in Tink-go handle construction

Priority HIGH 70CWE-1286Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

tink-go from 2.0.0 through 2.8.0 is affected. The keyset.NewHandleWithNoSecrets() and ReadWithNoSecrets() functions skip structural validation, so malformed public or no-secret keysets are accepted (CWE-1286). A remote attacker without privileges or user interaction can supply such a keyset, which can mislead applications that treat successful handle construction as proof of keyset integrity. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00193 9th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
tink-cryptotink-go2.0.0 – 2.8.0—No fix listedCNA
  • tink-go Vendortink-crypto Affected 2.0.0 – 2.8.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for tink-go.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109425
  2. 2026-10-13 Alias added: GHSA-5fgm-q74f-6j8f
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-13 CISA SSVC decision points changed
  5. 2026-10-13 Priority changed: LOW → HIGH
  6. 2026-11-06 Affected versions changed · Red Hat
  7. 2026-11-06 CVSS score added · Red Hat

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences