CVE-2026-42508
Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts
9.1
CRITICAL
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2026-42508
To remediate CVE-2026-42508, upgrade the affected package to a fixed version below.
- Debian/golang-go.crypto—no fix listed
- —upgrade to 0.52.0 or later
Is CVE-2026-42508 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- from 0, < 0.52.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |