CVE-2026-15432

HIGH

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

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v4 8.2

EPSS 0.0019

EPSS Percentile 8.4%

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-208

Status published

Products (2)

Google/Tink-Android All releases before 1.21.0, including 1.21.0.

Google/Tink-Java All releases before 1.21.0, including 1.21.0.

Published Jul 21, 2026

Tracked Since Jul 21, 2026