CVE-2026-15432

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

State: Published
Severity: 8.2 High
Published: Jul 21, 2026
Updated: Jul 22, 2026
Reserved: Jul 10, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	Google

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
Tink-JavaGoogle	All releases before 1.21.0, including 1.21.0.Affected
Tink-AndroidGoogle	All releases before 1.21.0, including 1.21.0.Affected

References

https://github.com/tink-crypto/tink-java/issues/75

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