CVE-2026-15432: When verifying a mac with a ChunkedMacVerification object, Tink compares the resulting tag with non constant t

Q: How do I fix CVE-2026-15432?

tink java: upgrade to newer than 1.21.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-15432 being exploited?

CVE-2026-15432 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-15432 affect?

CVE-2026-15432 affects tink java. Severity is medium (CVSS 5.9). 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 m

Q: How urgent is CVE-2026-15432?

Priority 28/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-15432 is a medium-severity flaw (CVSS 5.9) affecting tink java. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-208
Published	2026-07-21
Last modified	2026-09-22

Publisher (CNA): Google Inc. · Vendor: google

Last updated 2026-09-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 17:17 UTCPublished CVE record published
2026-09-22 13:09 UTCUpdated Record last modified

google tink java UPGRADE

Affected: <= 1.21.0

Fixed in: newer than 1.21.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tink-java || rpm -q tink-java || tink-java --version

2. UPGRADE to newer than 1.21.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tink-java

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tink-java

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-15432?

tink java: upgrade to newer than 1.21.0. Exact commands for each OS are on this page.

Is CVE-2026-15432 being exploited?

CVE-2026-15432 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-15432 affect?

CVE-2026-15432 affects tink java. Severity is medium (CVSS 5.9). 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 m

How urgent is CVE-2026-15432?

Priority 28/100. Remotely exploitable, no login, no user action

Software pages

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References

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