# CVE-2026-15432

## Summary

- **CVE ID:** CVE-2026-15432
- **Severity:** HIGH
- **CVSS Score:** 8.2 (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)
- **CWE:** CWE-208
- **Published:** Jul 21, 2026
- **Last Modified:** Jul 24, 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.

## Affected Products

- Google — Tink-Java (All releases before 1.21.0, including 1.21.0.)
- Google — Tink-Android (All releases before 1.21.0, including 1.21.0.)

## References

- [CNA](https://github.com/tink-crypto/tink-java/issues/75)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._