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

Quick assessment

Affected
tillitis tkeyclient
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tillitis TKey Client package是Tillitis AB开源的一个用于控制硬件安全密钥的Go语言客户端库。 Tillitis TKey Client package 1.2.0及之前版本存在安全漏洞，该漏洞源于缓冲区索引错误导致部分用户提供的秘密被忽略，可能产生重复的密钥材料。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials
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I. Basic Information for CVE-2026-32953

Vulnerability Information
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Vulnerability Title
Tillitis: TKey Client has an Error in Protocol Implementation
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5
Vulnerability Title
Tillitis TKey Client package 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tillitis TKey Client package是Tillitis AB开源的一个用于控制硬件安全密钥的Go语言客户端库。 Tillitis TKey Client package 1.2.0及之前版本存在安全漏洞，该漏洞源于缓冲区索引错误导致部分用户提供的秘密被忽略，可能产生重复的密钥材料。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tillitis tkeyclient < 1.3.0 -

II. Public POCs for CVE-2026-32953

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III. Intelligence Information for CVE-2026-32953

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Patches & Fixes for CVE-2026-32953 (1)

Vendor Advisories for CVE-2026-32953 (1)

Vendor Pages for CVE-2026-32953 (1)

IV. Related Vulnerabilities

Same vendor: tillitis
Same weakness: CWE-303