Riskcovery

CVE-2026-39832

Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

State
Published
Severity
9.1 Critical
Published
May 22, 2026
Updated
Sep 15, 2026
Reserved
Apr 7, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.19.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCISA-ADP
3.18.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:Nredhat-SADP

Weaknesses

  • CWE-281 Improper Preservation of Permissions

Affected Products

ProductVersions
golang.org/x/crypto/ssh/agentgolang.org/x/crypto
  • before 0.52.0Affected

References

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