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CVE-2026-39832 — Vulnerability in golang.org/x/crypto — CVE Details

CRITICAL

golang.org/x/crypto doesn't drop invoking agent constraints when forwarding keys

Published June 25, 2026Updated September 10, 2026Source: osv

Summary

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

Advisory Timeline

  • First published June 25, 2026 (109 days ago).
  • Last revised September 10, 2026 — 76 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
High
Availability
None

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

References

Frequently Asked Questions

What is CVE-2026-39832?
golang.org/x/crypto doesn't drop invoking agent constraints when forwarding keys 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-2026-39832?
CVE-2026-39832 affects golang.org/x/crypto. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-39832 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-f5wc-c3c7-36mc
GO-2026-5006

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