SSH key restriction bypass via omitted constraints
Published May 22, 2026 · Updated Aug 26, 2026
Security-control bypass in golang.org/x/crypto/ssh/agent before 0.52.0 allows attackers to use forwarded SSH keys without destination limits. The client.Add path omitted ConstraintExtensions while serializing a remote key-add request, and keyring.Add silently accepted unsupported constraints. Exploitation requires a destination-restricted key to be forwarded through an affected application, after which the remote host can use that key outside its intended destinations.
Summary
What happened
Security-control bypass in golang.org/x/crypto/ssh/agent before 0.52.0 allows attackers to use forwarded SSH keys without destination limits. The client.Add path omitted ConstraintExtensions while serializing a remote key-add request, and keyring.Add silently accepted unsupported constraints. Exploitation requires a destination-restricted key to be forwarded through an affected application, after which the remote host can use that key outside its intended destinations.
The record
- CVE
- CVE-2026-39832
- Published
- May 22, 2026
- Updated
- Aug 26, 2026
- Vendor
- 389 Directory Server
- Product
- Assisted Installer for OpenShift Container Platform
- Classifications
- CWE-281, T1021.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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