CVE-2026-42508 - Vulnerability Details

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.

Published: 2026-05-22

Score: 9.1 Critical

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

golang.org/x/crypto

golang.org/x/crypto/ssh/knownhosts

unaffected

Version	Status	Constraints
`0`	affected	< 0.52.0

Configuration 1 [-]

cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

No data.

Vendor Product Confidence Versions

Golang

Ssh

100%

Version	Status	Scheme	Platform
`[0,0.52.0)`	affected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
Github GHSA	GHSA-5cgq-3rg8-m6cv	golang.org/x/crypto vulnerable to auth bypass via unenforced @revoked status
Ubuntu USN	USN-8447-2	LXD vulnerabilities

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00568.

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://access.redhat.com/errata/RHSA-2026:23262
https://access.redhat.com/errata/RHSA-2026:23264
https://access.redhat.com/errata/RHSA-2026:26546
https://access.redhat.com/errata/RHSA-2026:26547
https://access.redhat.com/errata/RHSA-2026:35833
https://access.redhat.com/errata/RHSA-2026:36648
https://access.redhat.com/errata/RHSA-2026:36651
https://access.redhat.com/errata/RHSA-2026:36796
https://access.redhat.com/errata/RHSA-2026:36797
https://access.redhat.com/errata/RHSA-2026:36808
https://access.redhat.com/errata/RHSA-2026:37072
https://access.redhat.com/errata/RHSA-2026:37123
https://access.redhat.com/errata/RHSA-2026:37387
https://access.redhat.com/errata/RHSA-2026:40118
https://access.redhat.com/errata/RHSA-2026:40262
https://access.redhat.com/errata/RHSA-2026:40945
https://access.redhat.com/errata/RHSA-2026:41019
https://access.redhat.com/errata/RHSA-2026:41031
https://access.redhat.com/errata/RHSA-2026:41036
https://access.redhat.com/errata/RHSA-2026:41064
https://access.redhat.com/errata/RHSA-2026:41066
https://access.redhat.com/errata/RHSA-2026:42146
https://access.redhat.com/errata/RHSA-2026:42796
https://access.redhat.com/errata/RHSA-2026:43052
https://access.redhat.com/errata/RHSA-2026:43692
https://access.redhat.com/errata/RHSA-2026:46885
https://access.redhat.com/errata/RHSA-2026:47735
https://access.redhat.com/errata/RHSA-2026:47737
https://access.redhat.com/errata/RHSA-2026:49944
https://access.redhat.com/errata/RHSA-2026:51033
https://access.redhat.com/errata/RHSA-2026:51288
https://access.redhat.com/errata/RHSA-2026:52857
https://access.redhat.com/errata/RHSA-2026:52910
https://access.redhat.com/errata/RHSA-2026:54400
https://access.redhat.com/security/cve/CVE-2026-42508
https://bugzilla.redhat.com/show_bug.cgi?id=2480688
https://go.dev/cl/781220
https://go.dev/issue/79568
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
https://pkg.go.dev/vuln/GO-2026-5021
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42508.json

History

Thu, 13 Aug 2026 13:30:00 +0000

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:54400

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

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:52857 https://access.redhat.com/errata/RHSA-2026:52910

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 22:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-665

Fri, 22 May 2026 21:15:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-640

Fri, 22 May 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, '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-640

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

Type	Values Removed	Values Added
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.
Title		Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
References		https://go.dev/cl/781220 https://go.dev/issue/79568 https://groups.google.com/g/golang-announce/c/a082jnz-LvI https://pkg.go.dev/vuln/GO-2026-5021

Subscriptions

Golang Crypto Ssh

MITRE

Status: PUBLISHED

Assigner: Go

Published: 2026-05-22T02:31:27.644Z

Updated: 2026-08-14T16:38:13.877Z

Reserved: 2026-04-28T00:21:12.792Z

Link: CVE-2026-42508

Vulnrichment

Updated: 2026-08-14T12:04:30.062Z

NVD

Status : Modified

Published: 2026-05-22T04:16:25.440

Modified: 2026-08-14T13:18:48.400

Link: CVE-2026-42508

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-05-28T17:15:21Z

Weaknesses

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Now, both the 'key' and 'key.SignatureKey' are checked for @revoked."}, {"lang": "es", "value": "Anteriormente, una 'SignatureKey' revocada perteneciente a una CA no se verificaba correctamente su revocaci\u00f3n. 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Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

Exploitation none

Automatable yes

Technical Impact total

Subscriptions

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