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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-78mq-xcr3-xm33 golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/errata/RHSA-2026:26546 cve-icon
https://access.redhat.com/errata/RHSA-2026:26547 cve-icon
https://access.redhat.com/errata/RHSA-2026:36199 cve-icon
https://access.redhat.com/errata/RHSA-2026:36207 cve-icon
https://access.redhat.com/errata/RHSA-2026:36319 cve-icon
https://access.redhat.com/errata/RHSA-2026:36625 cve-icon
https://access.redhat.com/errata/RHSA-2026:36648 cve-icon
https://access.redhat.com/errata/RHSA-2026:36651 cve-icon
https://access.redhat.com/errata/RHSA-2026:36796 cve-icon
https://access.redhat.com/errata/RHSA-2026:36797 cve-icon
https://access.redhat.com/errata/RHSA-2026:37072 cve-icon
https://access.redhat.com/errata/RHSA-2026:37123 cve-icon
https://access.redhat.com/errata/RHSA-2026:37268 cve-icon
https://access.redhat.com/errata/RHSA-2026:37271 cve-icon
https://access.redhat.com/errata/RHSA-2026:37272 cve-icon
https://access.redhat.com/errata/RHSA-2026:37286 cve-icon
https://access.redhat.com/errata/RHSA-2026:37296 cve-icon
https://access.redhat.com/errata/RHSA-2026:37387 cve-icon
https://access.redhat.com/errata/RHSA-2026:37410 cve-icon
https://access.redhat.com/errata/RHSA-2026:38504 cve-icon
https://access.redhat.com/errata/RHSA-2026:40118 cve-icon
https://access.redhat.com/errata/RHSA-2026:40262 cve-icon
https://access.redhat.com/errata/RHSA-2026:40945 cve-icon
https://access.redhat.com/errata/RHSA-2026:40969 cve-icon
https://access.redhat.com/errata/RHSA-2026:40972 cve-icon
https://access.redhat.com/errata/RHSA-2026:40974 cve-icon
https://access.redhat.com/errata/RHSA-2026:41019 cve-icon
https://access.redhat.com/errata/RHSA-2026:41031 cve-icon
https://access.redhat.com/errata/RHSA-2026:41036 cve-icon
https://access.redhat.com/errata/RHSA-2026:41066 cve-icon
https://access.redhat.com/errata/RHSA-2026:42146 cve-icon
https://access.redhat.com/errata/RHSA-2026:42796 cve-icon
https://access.redhat.com/errata/RHSA-2026:43052 cve-icon
https://access.redhat.com/errata/RHSA-2026:43692 cve-icon
https://access.redhat.com/errata/RHSA-2026:46885 cve-icon
https://access.redhat.com/errata/RHSA-2026:47735 cve-icon
https://access.redhat.com/errata/RHSA-2026:47949 cve-icon
https://access.redhat.com/errata/RHSA-2026:48151 cve-icon
https://access.redhat.com/errata/RHSA-2026:51033 cve-icon
https://access.redhat.com/errata/RHSA-2026:51036 cve-icon
https://access.redhat.com/errata/RHSA-2026:51038 cve-icon
https://access.redhat.com/errata/RHSA-2026:52857 cve-icon
https://access.redhat.com/errata/RHSA-2026:52910 cve-icon
https://access.redhat.com/security/cve/CVE-2026-39835 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2480680 cve-icon
https://go.dev/cl/781660 cve-icon cve-icon
https://go.dev/issue/79563 cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/a082jnz-LvI cve-icon cve-icon
https://pkg.go.dev/vuln/GO-2026-5015 cve-icon cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.json cve-icon
History

Wed, 12 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
References

Tue, 11 Aug 2026 16:00:00 +0000


Thu, 28 May 2026 18:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Thu, 28 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Golang crypto
Weaknesses CWE-295
CPEs cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*
Vendors & Products Golang crypto

Fri, 22 May 2026 22:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 22 May 2026 20:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 22 May 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 22 May 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang ssh
Vendors & Products Golang
Golang ssh

Fri, 22 May 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 22 May 2026 03:30:00 +0000

Type Values Removed Values Added
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.
Title Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-08-13T12:04:35.874Z

Reserved: 2026-04-07T18:13:03.529Z

Link: CVE-2026-39835

cve-icon Vulnrichment

Updated: 2026-08-12T12:04:56.574Z

cve-icon NVD

Status : Modified

Published: 2026-05-22T04:16:24.530

Modified: 2026-08-12T12:19:05.990

Link: CVE-2026-39835

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T02:00:05Z

Weaknesses