All vulnerabilities
CVE-2026-39830
golang.org/x/crypto/ssh: Invoking client can cause server deadlock on unexpected responses
Description
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.
Patch Available
Fix available through Seal Security. No upgrade required, protect your application instantly.
Fix without upgrading
Score
9.1
Severity
Critical
Ecosystem
GO
Publish Date
June 25, 2026
Modified Date
June 25, 2026
Score Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Versions

