CVE-2026-39830criticalCWE-772

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

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.6%

exploitation probability

0.6%top 52% of all CVEs

observed exploitation

nono source reports 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.

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

Affected products

golang.org/x/crypto · golang.org/x/crypto/ssh

References