Riskcovery

CVE-2026-39830

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

State
Published
Severity
9.1 Critical
Published
May 22, 2026
Updated
Sep 18, 2026
Reserved
Apr 7, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.19.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HCISA-ADP
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat-SADP

Weaknesses

  • CWE-772 Missing Release of Resource after Effective Lifetime

Affected Products

ProductVersions
golang.org/x/crypto/sshgolang.org/x/crypto
  • before 0.52.0Affected

References

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