CVE intelligence

CVE-2026-39827

Vulnerability intelligence

Published May 22, 2026Sources checked Nov 11, 2026

6.5MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-39827 and is rated Medium severity with a CVSS score of 6.5. 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: Nov 4, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

1.12.15-8
1.30.10-25
1.7.1-5
25.0.3-18
1.9.5-14
2.27.0-13
1.31.0-23
8.7.11-7
0.14.0-15
2.62.0-17

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-39827?

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

Source: NVD