Critical severity · published May 22, 2026
CVE-2026-42508
Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
9.1
CVSS
6.9%
EPSS
No
On KEV
Description
Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)6.9% · higher than 94% 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/knownhosts · golang.org/x/crypto
before 0.52.0 · source: vendor
CR
Crypto · Golang
before 0.52.0 · source: NVD
CO
Cluster Observability Operator 1.5.0 · 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
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
OA
OpenShift API for Data Protection 1.5 · Red Hat
All versions, or not specified · source: CISA
OA
OpenShift API for Data Protection 1.6 · Red Hat
All versions, or not specified · source: CISA
OP
OpenShift Pipelines · Red Hat
All versions, or not specified · source: CISA
OS
OpenShift Serverless · Red Hat
All versions, or not specified · source: CISA
Affected product
GO
golang.org/x/crypto/ssh/knownhosts
golang.org/x/crypto
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42508
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42508
Issue Tracking
https://go.dev/cl/781220
Issue Tracking
https://go.dev/issue/79568
Mailing List
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-5021
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:23262
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:23264