VulnSocial

CVE-2026-42508Disclosure(golang / crypto)

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch golang crypto systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-295

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • crypto

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-05-30); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
golang
Products
crypto

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-30: 1Mentions · 2026-08-06: 1Patch / Workaround · 2026-05-30: 1Technical Details · 2026-05-30: 1Technical Details · 2026-08-06: 105-3008-06
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • Joey Romaine 🇺🇸 |=★=|@Tank23x0
    Disclosure

    Every week brings new attack surface. CVE-2026-42508 — take a look. http://golang.org/x/crypto/ssh/knownhosts vulnerable to auth bypass via unenforced @revoked status Build like the next disruption is already in motion — because it is.

    Post summary

    The tweet announces CVE-2026-42508, a vulnerability in the Go ssh knownhosts library that allows authentication bypass through an unenforced @revoked status, without providing PoC, exploit code, or patch information.

    0000050
    357 followersView on X
  • Upwind Security MDR@UpwindMDR
    Disclosure

    🚨 Critical - Go http://golang.org/x/crypto SSH Known Hosts Auth Bypass (CVE-2026-42508) A revoked CA SignatureKey in ssh/knownhosts was not checked against the @revoked marker — only the top-level key was validated, leaving certificate-based revocations silently unenforced. An attacker presenting a certificate signed by a revoked CA key can bypass host authentication entirely (CWE-295). 👉 Affected: http://golang.org/x/crypto/ < v0.52.0 | Upgrade to v0.52.0

    Post summary

    A critical vulnerability (CVE‑2026‑42508) in Go’s SSH known‑hosts handling allows bypass of host authentication via an unchecked revoked CA signature key; the issue is mitigated by upgrading to v0.52.0.

    0000098
    196 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appgolangcrypto-go-

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