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CVE-2026-39832

Critical

Description

When adding a key to a remote agent constraint extensions such as [email protected] 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.

SeverityCritical
CVSS9.1
Exploit probability—
ProductGolang Crypto
PublishedMay 22, 2026
First seenMay 22, 2026
Weakness typeCWE-281CWE-281

How to fix

Update
  • golang crypto0.52.0 or later
  • golang.org/x/crypto0.52.0 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
golang cryptov < 0.52.00.52.0
golang.org/x/cryptoGov < 0.52.00.52.0

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