Release History

Fiddler v6.0.20262

October 5, 2026

Version 6.0.20262

FIXED

• Fixed CVE-2026-77802: HTTP Request Smuggling Vulnerability
• Fixed CVE-2026-77803: Front-end Desynchronization Vulnerability
• Fixed CVE-2026-77804: Time-of-check Time-of-use (TOCTOU) Race Condition in Root Certificate Installation Vulnerability
• Fixed CVE-2026-77805: Weak Executable Signature Verification Vulnerability