Medium 5.3Published May 21, 2026

CVE-2026-39835Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh

Updated under an hour ago (Oct 27, 2026, 2:10 AM ET)

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It affects golang.org/x/crypto/ssh and 32 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for golang.org/x/crypto/ssh

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

golang.org/x/crypto golang.org/x/crypto/ssh golang.org_x_crypto:ssh (from the name)	before 0.52.0	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-19 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:1.43.1-3.el10_2 not affected	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4.22 redhat:openshift	from 0:4.22.0-202608010430.p2.g5f1e0e7.assembly.stream.el8 not affected	CISA ADP
Red Hat RHEM 1.0 for RHEL 9 redhat:edge_manager	from 0:1.0.3-1.el9em not affected	CISA ADP
Red Hat external secrets operator for Red Hat OpenShift 1.1 redhat:external_secrets_operator	from 1786614676 not affected	CISA ADP
Red Hat Logging Subsystem for Red Hat OpenShift 6.6 redhat:logging	from 1788439505 not affected	CISA ADP
Red Hat multicluster engine for Kubernetes 2.1 redhat:multicluster_engine	from 1784564438 not affected	CISA ADP
Red Hat OpenShift API for Data Protection 1.3 redhat:openshift_api_data_protection	from 1785177359 not affected	CISA ADP
Red Hat Red Hat Advanced Cluster Security 4.9 redhat:advanced_cluster_security	from 1781686446 not affected	CISA ADP
1–10 of 33

References

References

https://go.dev/issue/79563	issue-tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvI	mailing-list
https://go.dev/cl/781660	issue-tracking
https://pkg.go.dev/vuln/GO-2026-5015	vendor-advisory
https://access.redhat.com/errata/RHSA-2026:26546
https://access.redhat.com/errata/RHSA-2026:26547
https://access.redhat.com/errata/RHSA-2026:36199
https://access.redhat.com/errata/RHSA-2026:36207
https://access.redhat.com/errata/RHSA-2026:36319
https://access.redhat.com/errata/RHSA-2026:36625
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.