CVE-2026-15432 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Google	Tink Android Tink Java

No data.

No data.

References

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

History

Mon, 27 Jul 2026 23:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Google Google tink Android Google tink Java
Vendors & Products		Google Google tink Android Google tink Java

Wed, 22 Jul 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 21 Jul 2026 17:00:00 +0000

Type	Values Removed	Values Added
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.
Title		Observable Timing Discrepancy in Tink-Java and Tink-Android ChunkedMacVerification
Weaknesses		CWE-208
References		https://github.com/tink-crypto/tink-java/issues/75
Metrics		cvssV4_0 `{'score': 8.2, 'vector': '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'}`

MITRE

Status: PUBLISHED

Assigner: Google

Published: 2026-07-21T16:42:12.113Z

Updated: 2026-07-22T18:27:24.251Z

Reserved: 2026-07-10T17:38:15.752Z

Link: CVE-2026-15432

Vulnrichment

Updated: 2026-07-22T18:13:38.733Z

NVD

No data.

Redhat

No data.

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