CVE WatchJul 16, 2026

CVE-2026-39832

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com were not serialized in the request. D

CVSS

9.1

Critical

EPSS

0.5%

p41

KEV

—

Exploit Today

0-100

Published: May 22, 2026 · Last modified: Jul 16, 2026 · CWE-502 · CWE-281

EPSS · 30d

0.3%EPSS · 30 days0.5%

2026-06-302026-07-16

Technical 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.

Official references

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