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CVE intelligence

CVE-2026-39835

Vulnerability intelligence

Published May 22, 2026Sources checked Nov 11, 2026
5.3MEDIUMCVSS out of 10
What this means

Review the available evidence

CVE-2026-39835 and is rated Medium severity with a CVSS score of 5.3. 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
  • 8.7.11-7
  • 2.62.0-17
  • 0.14.0-15
  • 2.27.0-13
  • 1.31.0-23
CISA KEVNot listedBased on the latest collected catalog
EPSS0.5%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview

What is CVE-2026-39835?

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

Source: NVD