Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Tillitis | Tkey Client | < 1.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/tillitis/tkeyclient/commit/4954dccf0287657edf8d405057e134cdffPatch
- https://github.com/tillitis/tkeyclient/releases/tag/v1.3.0Release Notes
- https://github.com/tillitis/tkeyclient/security/advisories/GHSA-4w7r-3222-8h6vExploitVendor Advisory
FAQ
What is CVE-2026-32953?
CVE-2026-32953 is a vulnerability with a CVSS score of 4.6 (MEDIUM). 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) ...
How severe is CVE-2026-32953?
CVE-2026-32953 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32953?
Check the references section above for vendor advisories and patch information. Affected products include: Tillitis Tkey Client.