CVE-2026-39835
Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh
5.3
MEDIUM
CVSS 3.1
EPSS 0.03%
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.
How to fix CVE-2026-39835
To remediate CVE-2026-39835, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 0.52.0 or later
Is CVE-2026-39835 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 0, < 0.52.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |