Summaryinfo

A vulnerability was found in tillitis tkeyclient up to 1.2.x and classified as problematic. The affected element is an unknown function of the component Go Module. The manipulation results in incorrect implementation of authentication algorithm. This vulnerability is reported as CVE-2026-32953. An attack on the physical device is feasible. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in tillitis tkeyclient up to 1.2.x. It has been classified as problematic. Affected is an unknown code of the component Go Module. The manipulation with an unknown input leads to a incorrect implementation of authentication algorithm vulnerability. CWE is classifying the issue as CWE-303. The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-32953 since 03/17/2026. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.3.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 4954dccf0287657edf8d405057e134cdff9c59e8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• tillitis

Name

• tkeyclient

Version

• 1.0
• 1.1
• 1.2

License

• open-source

Website

• Product: https://github.com/tillitis/tkeyclient/

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Once again VulDB remains the best source for vulnerability data.

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