Medium severity · published May 22, 2026
CVE-2026-39828
Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh
6.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GO
golang.org/x/crypto/ssh · golang.org/x/crypto
before 0.52.0 · source: vendor
CR
Crypto · Golang
before 0.52.0 · source: NVD
AI
Assisted Installer for Red Hat OpenShift Container Platform 2 · Red Hat
All versions, or not specified · source: CISA
CM
Cert Manager support for Red Hat OpenShift release 1.19 · Red Hat
All versions, or not specified · source: CISA
CC
Confidential Compute Attestation · Red Hat
All versions, or not specified · source: CISA
C4
Cryostat 4 on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
DO
DevWorkspace Operator 0.42 · Red Hat
All versions, or not specified · source: CISA
ES
External Secrets Operator for Red Hat OpenShift · Red Hat
All versions, or not specified · source: CISA
LS
Logging Subsystem for Red Hat OpenShift 6.6 · Red Hat
All versions, or not specified · source: CISA
ME
Multicluster Engine for Kubernetes · Red Hat
All versions, or not specified · source: CISA
OA
OpenShift API for Data Protection 1.3 · Red Hat
All versions, or not specified · source: CISA
OA
OpenShift API for Data Protection 1.4 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39828
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39828
Issue Tracking
https://go.dev/cl/781621
Issue Tracking
https://go.dev/issue/79562
Mailing List
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-5014
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:26546
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:26547
More from golang.org/x/crypto/ssh
10.0
CVE-2026-46595
Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh
9.1
CVE-2026-39834
Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh
9.1
CVE-2026-39831
Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh
9.1
CVE-2026-39830
Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh
7.5
CVE-2026-56855
Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh