CVE intelligence

CVE-2026-39832

Vulnerability intelligence

Published May 22, 2026Sources checked Nov 11, 2026

9.1CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-39832 and is rated Critical severity with a CVSS score of 9.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Jun 2, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

0.14.0-13
2.27.0-11
1.9.5-14
1.31.0-21

CISA KEVNot listedBased on the latest collected catalog

EPSS0.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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. 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.

Source: NVD