CVE-2026-42508 | BDVDB-2026-334587 Detail

golang.org/x/cryptogolang.org/x/crypto/ssh/knownhosts

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-295 Improper Certificate Validation

References#

Show all 40

Exploit#

No public exploit known

History#

Version 12026-05-22Record published in the CVE List.
Version 22026-09-15Most recent update recorded in the CVE List.

Published

Published: 2026-05-22
Last modified: 2026-09-15

Vendor information

Vendor: golang.org/x/crypto
Product: golang.org/x/crypto/ssh/knownhosts

All golang.org/x/crypto vulnerabilities

Score

9.1 Critical

EPSS

6.9%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 94.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 0.52.0
Fixed
0.52.0

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).