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Product · Progress Software

Progress® Telerik® Fiddler® Classic

4 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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  • Low 3.6
    CVE-2026-77803

    Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic

    In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, front-end request desynchronization is possible in the proxy request forwarding component. A request that contains both a Content-Length and a Transfer-Encoding header is …

    Progress Software Progress® Telerik® Fiddler® Classic