What is GHSA-5cgq-3rg8-m6cv?

GHSA-5cgq-3rg8-m6cv is a security advisory published by GitHub Security Advisories with Critical severity. golang.org/x/crypto/ssh/knownhosts vulnerable to auth bypass via unenforced @revoked status

Which CVE IDs does GHSA-5cgq-3rg8-m6cv cover?

GHSA-5cgq-3rg8-m6cv covers the following CVE IDs: CVE-2026-42508. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-5cgq-3rg8-m6cv?

GHSA-5cgq-3rg8-m6cv has a CVSS v3 base score of 9.1, published by GitHub Security Advisories.

Which products are affected by GHSA-5cgq-3rg8-m6cv?

GHSA-5cgq-3rg8-m6cv affects 1 product, including: go/golang.org/x/crypto/ssh/knownhosts:\u003c 0.52.0.

GHSA-5cgq-3rg8-m6cvCriticalCVSS 9.1

golang.org/x/crypto/ssh/knownhosts vulnerable to auth bypass via unenforced @revoked status

Vendor

GitHub Security Advisories

Published

June 25, 2026

Last Modified

June 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-42508 →

📋 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.

🎯 Affected products1

go/golang.org/x/crypto/ssh/knownhosts:< 0.52.0

🔗 References (6)

https://nvd.nist.gov/vuln/detail/CVE-2026-42508
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://github.com/advisories/GHSA-5cgq-3rg8-m6cv