CVE-2023-32691: Go Simple Tunnel Project Go Simple Tunnel

Medium severity, CVSS 5.9. EPSS: 0.6% chance of exploitation in the next 30 days.

gost (GO Simple Tunnel) is a simple tunnel written in golang. Sensitive secrets such as passwords, token and API keys should be compared only using a constant-time comparison function. Untrusted input, sourced from a HTTP header, is compared directly with a secret. Since this comparison is not secure, an attacker can mount a side-channel timing attack to guess the password. As a workaround, this can be easily fixed using a constant time comparing function such as `crypto/subtle`'s `ConstantTimeCompare`.

Affected products

• Go Simple Tunnel Project Go Simple Tunnel: up to and including 2.11.5

Published 2023-05-30. Last modified 2026-06-17.