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.
Published: 2026-05-22
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-vgwf-h737-ff37 golang.org/x/crypto/ssh: Invoking client can cause server deadlock on unexpected responses
Ubuntu USN Ubuntu USN USN-8447-2 LXD vulnerabilities
Ubuntu USN Ubuntu USN USN-8447-3 Google Guest Agent vulnerabilities
History

Tue, 02 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Golang crypto
Weaknesses CWE-119
CPEs cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*
Vendors & Products Golang crypto

Fri, 22 May 2026 22:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
CWE-787

Fri, 22 May 2026 21:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
CWE-787

Fri, 22 May 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 22 May 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang ssh
Vendors & Products Golang
Golang ssh

Fri, 22 May 2026 05:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
CWE-787

Fri, 22 May 2026 03:30:00 +0000

Type Values Removed Values Added
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.
Title Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-05-22T18:54:54.686Z

Reserved: 2026-04-07T18:13:03.528Z

Link: CVE-2026-39830

cve-icon Vulnrichment

Updated: 2026-05-22T18:54:49.174Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-22T04:16:22.440

Modified: 2026-06-17T10:42:39.483

Link: CVE-2026-39830

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-02T17:30:13Z

Weaknesses