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TI-2026-12987 Aliases CVE-2026-15432GHSA-xxmf-j3rw-f8p2

Observable Timing Discrepancy in Tink-Java and Tink-Android ChunkedMacVerification

Priority LOW 35CWE-208Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-208.

Summary

When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant time comparison. This potentially allows an attacker to use timinig information as a side channel in order to get information how many bytes of a given tag match the correct tag. This in turn could allow to find a correct tag bytewise.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00183 7th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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
GoogleTink-JavaAll releases before 1.21.0, including 1.21.0.—No fix listedCNA
GoogleTink-AndroidAll releases before 1.21.0, including 1.21.0.—No fix listedCNA
  • Tink-Java VendorGoogle Affected All releases before 1.21.0, including 1.21.0. Fixed in — No fix listed CNA
  • Tink-Android VendorGoogle Affected All releases before 1.21.0, including 1.21.0. Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:google:tink_java:*:*:*:*:*:*:*:*up to 1.21.0VulnerableGoogle
  • cpe:2.3:a:google:tink_java:*:*:*:*:*:*:*:* Versions up to 1.21.0 Vulnerable ·Google

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-15432
  2. 2026-10-03 Alias added: GHSA-xxmf-j3rw-f8p2

References

Patch 1

  • TI-2020-07166 Ciphertext integrity weakness in Tink CVSS 3.1MEDIUM 5.3

Sources

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