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Security Advisories

GO-2026-5015

https://pkg.go.dev/vuln/GO-2026-5015

Severity

5.3

Medium

CVSS V3

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Summary

Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

Description

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-39835
  • https://github.com/advisories/GHSA-78mq-xcr3-xm33
  • https://pkg.go.dev/vuln/GO-2026-5015
  • https://go.dev/issue/79563
  • https://groups.google.com/g/golang-announce/c/a082jnz-LvI
  • https://go.dev/cl/781660

Affected packages

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