CVE-2026-15432 Observable Timing Discrepancy in Tink-Java and Tink-Android ChunkedMacVerification
Attackers can exploit timing side channels in Tink's ChunkedMacVerification to recover valid MAC tags byte-by-byte, compromising message integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15432?
CVE-2026-15432 is a high-severity vulnerability in Google Tink-Android, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-208
Which versions are affected by CVE-2026-15432?
It affects 1 product.
Products include Google Tink Java.
How do I fix CVE-2026-15432?
No fix has been published for CVE-2026-15432 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-15432 being exploited?
There is no known exploitation of CVE-2026-15432 in the wild and no public exploit code.
Other vulnerabilities in Google Tink-Android
Sources
Also known as GHSA-xxmf-j3rw-f8p2.