Improper Authentication Affecting github.com/golang/crypto/ssh package, versions <0.52.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMGOLANGCRYPTOSSH-16795345
- published22 May 2026
- disclosed22 May 2026
- creditUnknown
Introduced: 22 May 2026
CVE-2026-39831 (opens in a new tab)How to fix?
Upgrade github.com/golang/crypto/ssh to version 0.52.0 or higher.
Overview
github.com/golang/crypto/ssh is a SSH client and server
Affected versions of this package are vulnerable to Improper Authentication due to the Verify method not checking the User Presence flag in FIDO/U2F security key types. An attacker can perform unauthorized authentication by generating signatures without requiring physical interaction with the hardware security key.