CVE-2026-39835

MEDIUM

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

Title source: cna

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.

References (4)

Core 4

Core References

https://go.dev/issue/79563

https://groups.google.com/g/golang-announce/c/a082jnz-LvI

https://go.dev/cl/781660

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

Scores

CVSS v3 5.3

EPSS 0.0021

EPSS Percentile 10.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-295

Status published

Products (2)

golang/crypto < 0.52.0

golang.org/x/crypto/golang.org/x/crypto/ssh < 0.52.0

Published May 22, 2026

Tracked Since May 22, 2026