CVE-2026-32953: Tillitis TKey Client package is a Go package for a TKey client

Q: How do I fix CVE-2026-32953?

tkey client: upgrade to 1.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-32953 being exploited?

CVE-2026-32953 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-2026-32953 affect?

CVE-2026-32953 affects tkey client. Severity is medium (CVSS 4.6). Tillitis TKey Client package is a Go package for a TKey client. Versions 1.2.0 and below contain a critical bug in the tkeyclient Go module which causes 1 out of every 256 User Supplied Secrets (USS) to be silently ignored, producing the sa

Q: How urgent is CVE-2026-32953?

Priority 25/100. Public exploit reference

Routine

MEDIUM 4.6UPGRADE

CVE-2026-32953 is a medium-severity flaw (CVSS 4.6) affecting tkey client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tillitis TKey Client package is a Go package for a TKey client. Versions 1.2.0 and below contain a critical bug in the tkeyclient Go module which causes 1 out of every 256 User Supplied Secrets (USS) to be silently ignored, producing the same Compound Device Identifier (CDI)—and thus the same key material—as if no USS is provided. This happens because a buffer index error overwrites the USS-enabled boolean with the first byte of the USS digest, s

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-303
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: tillitis

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 05:16 UTCPublished CVE record published
2026-06-17 10:36 UTCUpdated Record last modified

tillitis tkey client UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tkey-client || rpm -q tkey-client || tkey-client --version

2. UPGRADE to 1.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tkey-client

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tkey-client

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-2026-32953?

tkey client: upgrade to 1.3.0. Exact commands for each OS are on this page.

Is CVE-2026-32953 being exploited?

CVE-2026-32953 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-2026-32953 affect?

CVE-2026-32953 affects tkey client. Severity is medium (CVSS 4.6). Tillitis TKey Client package is a Go package for a TKey client. Versions 1.2.0 and below contain a critical bug in the tkeyclient Go module which causes 1 out of every 256 User Supplied Secrets (USS) to be silently ignored, producing the sa

How urgent is CVE-2026-32953?

Priority 25/100. Public exploit reference

References

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