VulnerabilityAwaiting Analysis

CVE-2026-15432

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.

HIGH 8.2EPSS 0.20%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 4.0: 8.2 HIGHCVSS: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/M
EPSS: 0.20% probability · 10th percentile
CISA KEV: Not listed
Weakness: CWE-208
Source: cve-coordination@google.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.