4.7

CVE-2026-32953: Tillitis: TKey Client has an Error in Protocol Implementation

Analyzed
AliasesUBUNTU-CVE-2026-32953DEBIAN-CVE-2026-32953GHSA-4w7r-3222-8h6v
Published 20-03-2026Last modified 20-03-2026

Vulnerability summary

CVE-2026-32953 is a medium (CVSS 4.7) vulnerability in tillitis tkey_client. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.7, physical access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.7/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1135-1

Timeline

  1. 20-03-2026
    PublishedVulnerability first disclosed.
  2. 20-03-2026
    Last modifiedVulnerability information updated.

Description

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, so any USS whose hash starts with 0x00 is effectively discarded. This issue has been fixed in version 1.3.0. Users unable to upgrade immediately should switch to a USS whose hash does not begin with a zero byte.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.22% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Tkeyclient

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: physical access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Tillitis2 products
Debian1 product
  • golang-github-tillitis-tkeyclientAll versions (No fix recorded) | < 1.3.0-1
Github.com/tillitis1 product
  • tkeyclient< 1.3.0
Ubuntu1 product
  • golang-github-tillitis-tkeyclientAll versions (No fix recorded)

4 vendors · 5 products

References

8 links