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CVE-2026-39830 — Vulnerability in golang.org/x/crypto — CVE Details

CRITICAL

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

Published June 25, 2026Updated September 15, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published June 25, 2026 (109 days ago).
  • Last revised September 15, 2026 — 82 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update golang.org/x/crypto to 0.52.0 or later
go get golang.org/x/crypto@v0.52.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
golang.org/x/crypto
go
All versions0.52.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

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

References

Frequently Asked Questions

What is CVE-2026-39830?
golang.org/x/crypto: Invoking client can cause server deadlock on unexpected responses This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-39830?
CVE-2026-39830 affects golang.org/x/crypto. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-39830 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-vgwf-h737-ff37
GO-2026-5017

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