CVE-2026-39828

MEDIUM

6.3

CVSS v3

Description

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

CWE-295Improper Certificate Validation CWE-281

How to fix

Remediation Available

golang-go.cryptoDebian

Fixed in:1:0.52.0-1CVE-2026-39828

conforma-cli-stackRed Hat / RHEL

Fixed in:v1-4@arm64_darwinRHSA-2026:50888

Fixed in:v1-4@s390xRHSA-2026:48771

Fixed in:v1-4@amd64RHSA-2026:48771

Fixed in:v1-4@amd64RHSA-2026:37276

Fixed in:v1-4@amd64RHSA-2026:50888

Fixed in:v1-4@ppc64leRHSA-2026:37276

Fixed in:v1-4@arm64_darwinRHSA-2026:36797

Fixed in:v1-4@arm64RHSA-2026:49767

conforma-cli-stackRocky

Fixed in:v1-4@amd64RHSA-2026:36797

Fixed in:v1-4@ppc64leRHSA-2026:36797

Fixed in:v1-4@s390xRHSA-2026:50888

Fixed in:v1-4@amd64_darwinRHSA-2026:37276

Fixed in:v1-4@s390xRHSA-2026:37276

Fixed in:v1-4@amd64_windowsRHSA-2026:50888

Fixed in:v1-4@arm64_darwinRHSA-2026:36797

Fixed in:v1-4@arm64_darwinRHSA-2026:49767

cosign-cli-stackRed Hat / RHEL

Fixed in:v1-4@ppc64leRHSA-2026:36797

Fixed in:v1-4@amd64_darwinRHSA-2026:36797

Fixed in:v1-4@amd64_windowsRHSA-2026:50888

Fixed in:v1-4@amd64RHSA-2026:50888

Fixed in:v1-4@arm64_darwinRHSA-2026:49767

Fixed in:v1-4@amd64RHSA-2026:49767

Fixed in:v1-4@arm64_darwinRHSA-2026:37276

Fixed in:v1-4@amd64_darwinRHSA-2026:50888

cosign-cli-stackRocky

Fixed in:v1-4@amd64RHSA-2026:49767

Fixed in:v1-4@amd64_windowsRHSA-2026:49767

Fixed in:v1-4@amd64_darwinRHSA-2026:36797

Fixed in:v1-4@s390xRHSA-2026:49767

Fixed in:v1-4@amd64RHSA-2026:50888

Fixed in:v1-4@arm64RHSA-2026:37276

Fixed in:v1-4@arm64_darwinRHSA-2026:49767

Fixed in:v1-4@arm64_darwinRHSA-2026:36797

cryostat/cryostatRed Hat / RHEL

Fixed in:db-rhel9@sha256:c1d344fddcfb7ff4ca4bc3a2ba88917c918879b8411aef0dc1c252e151e7df5f_arm64RHSA-2026:48151

Fixed in:rhel9@sha256:c0b028b465d8e6f3b262659195c01deee13538c1e34a823bffb7624bbb5252fc_amd64RHSA-2026:48151

Fixed in:operator-bundle@sha256:8aba4092e4ca595ee8df8f878754f698059c72d956022a1fe9e123d6ed7a7fa6_amd64RHSA-2026:48151

Fixed in:db-rhel9@sha256:1dadbcd03e36720ff1bccd2fa77cdb7096e94322794f5ad3b8a511d08c0c30d3_amd64RHSA-2026:48151

Fixed in:reports-rhel9@sha256:a93361b346844f7ec4108a9658cb5fdd61c8963e90ee15e52fb213b1bb4d01c6_arm64RHSA-2026:48151

Fixed in:storage-rhel9@sha256:a6ab21c3097a8268cba87c6eeb1f512454da0c68410031c4160c7d7378920850_arm64RHSA-2026:48151

Fixed in:reports-rhel9@sha256:b34a578607642a41719d12a902df7b4549606f37e773f6b20ed047b94c1739fe_amd64RHSA-2026:48151

Fixed in:rhel9-operator@sha256:bd3419415c6e31e2c5269b371d8097e69cad1ff84cea5b98b4892ffad05a501f_arm64RHSA-2026:48151

cryostat/cryostatRocky

Fixed in:reports-rhel9@sha256:a93361b346844f7ec4108a9658cb5fdd61c8963e90ee15e52fb213b1bb4d01c6_arm64RHSA-2026:48151

Fixed in:storage-rhel9@sha256:51b54fe0f6d011cd59eaa810f62d4d8b8dde5c0ebd75684cbc2eac104466c467_amd64RHSA-2026:48151

Fixed in:rhel9@sha256:c0b028b465d8e6f3b262659195c01deee13538c1e34a823bffb7624bbb5252fc_amd64RHSA-2026:48151

Fixed in:reports-rhel9@sha256:b34a578607642a41719d12a902df7b4549606f37e773f6b20ed047b94c1739fe_amd64RHSA-2026:48151

Fixed in:storage-rhel9@sha256:a6ab21c3097a8268cba87c6eeb1f512454da0c68410031c4160c7d7378920850_arm64RHSA-2026:48151

Fixed in:operator-bundle@sha256:8aba4092e4ca595ee8df8f878754f698059c72d956022a1fe9e123d6ed7a7fa6_amd64RHSA-2026:48151

Fixed in:operator-bundle@sha256:f6f18f4a84f0a0381e5d03893d2968050537f7e20b08b61b54e922c4d9359292_arm64RHSA-2026:48151

Fixed in:db-rhel9@sha256:c1d344fddcfb7ff4ca4bc3a2ba88917c918879b8411aef0dc1c252e151e7df5f_arm64RHSA-2026:48151

cryostat/cryostat-agentRed Hat / RHEL

Fixed in:init-rhel9@sha256:56a21c05b7e6face6abbb05a1165d02640779cda3dc829e21237840e7cbac579_amd64RHSA-2026:48151

Fixed in:init-rhel9@sha256:a9a7a4aff8961cea3f5a4cd5b3370c5f13105e9461f4fb0de70bcfa7b5facab1_arm64RHSA-2026:48151

cryostat/cryostat-agentRocky

Fixed in:init-rhel9@sha256:a9a7a4aff8961cea3f5a4cd5b3370c5f13105e9461f4fb0de70bcfa7b5facab1_arm64RHSA-2026:48151

Fixed in:init-rhel9@sha256:56a21c05b7e6face6abbb05a1165d02640779cda3dc829e21237840e7cbac579_amd64RHSA-2026:48151

cryostat/cryostat-grafanaRed Hat / RHEL

Fixed in:dashboard-rhel9@sha256:681a38cf4bd5f892dd76e634d754106d55c1dc78ed1a59c6003fd75d8e285101_arm64RHSA-2026:48151

Fixed in:dashboard-rhel9@sha256:ea227ce33a7d948d284c10f3f590ddfdc5058459a52b87c46ce882ac32a82a0f_amd64RHSA-2026:48151

cryostat/cryostat-grafanaRocky

Fixed in:dashboard-rhel9@sha256:681a38cf4bd5f892dd76e634d754106d55c1dc78ed1a59c6003fd75d8e285101_arm64RHSA-2026:48151

Fixed in:dashboard-rhel9@sha256:ea227ce33a7d948d284c10f3f590ddfdc5058459a52b87c46ce882ac32a82a0f_amd64RHSA-2026:48151

cryostat/cryostat-openshift-consoleRed Hat / RHEL

Fixed in:plugin-rhel9@sha256:c8915feceaaf08a0f3a05df8a61f44b8cfca2b23872219828a694cee047252a1_amd64RHSA-2026:48151

Fixed in:plugin-rhel9@sha256:f226753fa98b6492d7fffc0d669d1e003f5146c6214d3cbad96d0e3fd8f03663_arm64RHSA-2026:48151

cryostat/cryostat-openshift-consoleRocky

Fixed in:plugin-rhel9@sha256:f226753fa98b6492d7fffc0d669d1e003f5146c6214d3cbad96d0e3fd8f03663_arm64RHSA-2026:48151

Fixed in:plugin-rhel9@sha256:c8915feceaaf08a0f3a05df8a61f44b8cfca2b23872219828a694cee047252a1_amd64RHSA-2026:48151

cryostat/jfrRed Hat / RHEL

Fixed in:datasource-rhel9@sha256:2d9c9f1cd1ff98721ea2ee56e86319bc6bc403f9b444e0fbe802ecb89b589134_amd64RHSA-2026:48151

Fixed in:datasource-rhel9@sha256:89b841456cfe46bf4d3b6bd32dea131c51241d2b1bd266d408eac78ed79c395a_arm64RHSA-2026:48151

cryostat/jfrRocky

Fixed in:datasource-rhel9@sha256:89b841456cfe46bf4d3b6bd32dea131c51241d2b1bd266d408eac78ed79c395a_arm64RHSA-2026:48151

Fixed in:datasource-rhel9@sha256:2d9c9f1cd1ff98721ea2ee56e86319bc6bc403f9b444e0fbe802ecb89b589134_amd64RHSA-2026:48151

fetch-tsa-certs-cli-stackRocky

Fixed in:v1-4@ppc64leRHSA-2026:48771

Fixed in:v1-4@amd64_darwinRHSA-2026:37276

Fixed in:v1-4@amd64RHSA-2026:37276

Fixed in:v1-4@amd64RHSA-2026:48771

Fixed in:v1-4@arm64RHSA-2026:50888

Fixed in:v1-4@amd64_windowsRHSA-2026:50888

Fixed in:v1-4@amd64RHSA-2026:36797

Fixed in:v1-4@amd64_windowsRHSA-2026:37276

fetch-tsa-certs-cli-stackRed Hat / RHEL

Fixed in:v1-4@amd64_darwinRHSA-2026:50888

Fixed in:v1-4@ppc64leRHSA-2026:48771

Fixed in:v1-4@amd64_windowsRHSA-2026:48771

Fixed in:v1-4@arm64_darwinRHSA-2026:50888

Fixed in:v1-4@arm64RHSA-2026:48771

Fixed in:v1-4@arm64_darwinRHSA-2026:48771

Fixed in:v1-4@amd64RHSA-2026:50888

Fixed in:v1-4@amd64_windowsRHSA-2026:36797

flightctlRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctlRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-agentRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-agentRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

flightctl-cliRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-cliRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-observabilityRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

flightctl-observabilityRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

flightctl-selinuxRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-selinuxRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-servicesRocky

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

flightctl-servicesRed Hat / RHEL

Fixed in:0:1.1.3-1.el10emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

Fixed in:0:1.1.3-1.el9emRHSA-2026:41019

flightctl-telemetry-gatewayRocky

Fixed in:0:1.0.3-1.el9emRHSA-2026:36796

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Vendor Advisory1

pkg.go.dev

Issue Tracking2

Mailing List1

groups.google.com

Other references46

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	84%	KEV	Fix
CVE-2023-27823	Critical	9.8	53%	-	-
CVE-2022-42979	High	8.8	24%	-	-

Common questions

How do I fix CVE-2026-39828?

Published advisories record a fix for 197 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-39828 being actively exploited?

Not that we know of. CVE-2026-39828 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.37% is the estimated probability that it will be exploited in the next 30 days. That is higher than 30% of all scored CVEs.

How severe is CVE-2026-39828?

CVE-2026-39828 has a CVSS v3 base score of 6.3, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-39828 affect?

Published advisories record a fix for golang-go.crypto (Debian), conforma-cli-stack (Red Hat / RHEL), conforma-cli-stack (Rocky), cosign-cli-stack (Red Hat / RHEL), and 193 more. The list on this page is capped, so there may be more.

Embed a live status badge for CVE-2026-39828

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-28.