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

OpenSSH · CVE-2026-39832
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
9.1
EPSS
0.7%
First seen
1 d ago
Status
corroborated

All OpenSSH vulnerabilities