CVE intelligence

CVE-2026-13608

Vulnerability intelligence

Published Sep 6, 2026Sources checked Oct 28, 2026

7.4HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-13608 and is rated High severity with a CVSS score of 7.4. 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: Oct 17, 2026

Release Notes

Vendor-listed releases

8.11.1-12

Ubuntu Security Notices guidance

Vendor revision: Sep 24, 2026

This issue was previously fixed in USN-8487-1, but that fix was incomplete for Ubuntu 16.04 LTS.

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-2026-13608?

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.

Source: NVD