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Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

golang.org/x/crypto/ssh · CVE-2026-39830
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What is it?

A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
9.1
EPSS
0.6%
First seen
1 d ago
Status
corroborated

All golang.org/x/crypto vulnerabilities