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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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  • Medium 6.6
    CVE-2026-77804

    Time-of-check Time-of-use (TOCTOU) Race Condition in Root Certificate Installation in Progress® Telerik® Fiddler® Classic

    In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, a time-of-check time-of-use (TOCTOU) race condition exists in the installation of the HTTPS interception root certificate into the Local Computer certificate store. Fiddle…

    Progress Software Progress® Telerik® Fiddler® Classic
  • Medium 6.3
    CVE-2026-77802

    HTTP Request Smuggling Vulnerability in Progress® Telerik® Fiddler® Classic

    In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, HTTP request smuggling is possible in the proxy request forwarding component. Requests containing multiple Content-Length headers with conflicting values are forwarded ver…

    Progress Software Progress® Telerik® Fiddler® Classic