CVE-2026-39835

high

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

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.json

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

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

https://go.dev/issue/79563

https://go.dev/cl/781660

https://bugzilla.redhat.com/show_bug.cgi?id=2480680

https://access.redhat.com/security/cve/CVE-2026-39835

https://access.redhat.com/errata/RHSA-2026:48151

https://access.redhat.com/errata/RHSA-2026:47949

https://access.redhat.com/errata/RHSA-2026:47735

https://access.redhat.com/errata/RHSA-2026:46885

https://access.redhat.com/errata/RHSA-2026:43692

https://access.redhat.com/errata/RHSA-2026:43052

https://access.redhat.com/errata/RHSA-2026:42796

https://access.redhat.com/errata/RHSA-2026:42146

https://access.redhat.com/errata/RHSA-2026:41066

https://access.redhat.com/errata/RHSA-2026:41036

https://access.redhat.com/errata/RHSA-2026:41031

https://access.redhat.com/errata/RHSA-2026:41019

https://access.redhat.com/errata/RHSA-2026:40974

https://access.redhat.com/errata/RHSA-2026:40972

https://access.redhat.com/errata/RHSA-2026:40969

https://access.redhat.com/errata/RHSA-2026:40945

https://access.redhat.com/errata/RHSA-2026:40262

https://access.redhat.com/errata/RHSA-2026:40118

https://access.redhat.com/errata/RHSA-2026:38504

https://access.redhat.com/errata/RHSA-2026:37410

https://access.redhat.com/errata/RHSA-2026:37387

https://access.redhat.com/errata/RHSA-2026:37296

https://access.redhat.com/errata/RHSA-2026:37286

https://access.redhat.com/errata/RHSA-2026:37272

https://access.redhat.com/errata/RHSA-2026:37271

https://access.redhat.com/errata/RHSA-2026:37268

https://access.redhat.com/errata/RHSA-2026:37123

https://access.redhat.com/errata/RHSA-2026:37072

https://access.redhat.com/errata/RHSA-2026:36797

https://access.redhat.com/errata/RHSA-2026:36796

https://access.redhat.com/errata/RHSA-2026:36651

https://access.redhat.com/errata/RHSA-2026:36648

https://access.redhat.com/errata/RHSA-2026:36625

https://access.redhat.com/errata/RHSA-2026:36319

https://access.redhat.com/errata/RHSA-2026:36207

https://access.redhat.com/errata/RHSA-2026:36199

https://access.redhat.com/errata/RHSA-2026:26547

https://access.redhat.com/errata/RHSA-2026:26546

Details

Source: Mitre, NVD

Published: 2026-05-22

Updated: 2026-08-03

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00019