CVSS 4.0
4.7 mediumCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:HCVE-2026-32953
Medium (4.7) in tillitis tkey client. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/tillitis/tkeyclient 1.3.0.
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.
Severity
CVSS 3.1
4.6 mediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- CWE
- CWE-303
- Published
- Modified
- Record from
- the NVD, synced
Affected
- tillitis:tkey_client
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4w7r-3222-8h6v | Go | github.com/tillitis/tkeyclient | <1.3.0 | 1.3.0 |
| GO-2026-4728 | Go | github.com/tillitis/tkeyclient | <1.3.0 | 1.3.0 |