CVE-2026-77803 | Progress Telerik Fiddler Classic prior 6.0.20262.10021 Proxy Request Forwarding encoding error

October 5, 2026 Yanac

A vulnerability, which was classified as problematic, was found in Progress Telerik Fiddler Classic. This issue affects some unknown processing of the component Proxy Request Forwarding. The manipulation results in encoding error.

This vulnerability is cataloged as CVE-2026-77803. The attack must be initiated from a local position. There is no exploit available.

You should upgrade the affected component.VulDB Recent EntriesRead More