CVE-2026-13608: Haxx Curl

High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Haxx Curl: from 7.82.0, before 8.22.0 (fixed in 8.22.0)

Published 2026-09-06. Last modified 2026-09-15.