CVE-2026-77802— Progress Telerik Fiddler Classic HTTP请求走私漏洞
一分钟漏洞结论
影响对象
Progress Software Progress® Telerik® Fiddler® Classic
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
In Progress® Telerik® Fiddler® Classic for Windows 版本早于 v6.0.20262.10021 时，在代理请求转发组件中存在 HTTP 请求走私漏洞。当请求包含多个值相互冲突的 Content-Length 头时，Fiddler 会将这些请求原封不动地转发给原始服务器，但其本身在构造请求体时仅使用第一个 Content-Length 的值。具备低权限的本地攻击者，若能通过另一个用户所使用的同一 Fiddler 代理实例发送请求，则可利用这种与原始服务器（该服务器不兼
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一、 漏洞 CVE-2026-77802 基础信息
漏洞信息
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Vulnerability Title
HTTP Request Smuggling Vulnerability in Progress® Telerik® Fiddler® Classic
来源: CVE Program / CVE List V5
Vulnerability Description
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 verbatim to the origin server, while Fiddler frames the request body using only the first Content-Length value. A local threat actor with low privileges who is able to send requests through the same Fiddler proxy instance as another user can exploit this desynchronization against a non-RFC-9110-compliant origin server that keeps the connection alive to smuggle an additional request. Because Fiddler returns the server connection to its pipe pool after reading only the first response, the unread smuggled response remains buffered on the socket and is served to the next session that reuses that connection, allowing the attacker to poison responses delivered to other users and to obtain responses intended for them.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Progress Software | Progress® Telerik® Fiddler® Classic | 1.0.0 ~ 6.0.20262.10021 | - |
|
二、漏洞 CVE-2026-77802 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-77802 其他参考 (1)
同批安全公告 · Progress Software · 2026-10-05 · 共 5 条
| CVE-2026-92931 | 10.0 CRITICAL | Progress Sitefinity Next.js 渲染SDK服务端请求伪造漏洞 |
| CVE-2026-77805 | 7.9 HIGH | Progress Telerik Fiddler Classic 弱可执行签名验证漏洞 |
| CVE-2026-77804 | 6.6 MEDIUM | Progress Telerik Fiddler Classic 根证书安装TOCTOU竞争漏洞 |
| CVE-2026-77803 | 3.6 LOW | Progress Telerik Fiddler Classic 前端不同步漏洞 |
IV. Related Vulnerabilities
Same vendor: Progress Software
-
CVE-2026-92931
Progress Sitefinity Next.js 渲染SDK服务端请求伪造漏洞 -
CVE-2026-77805
Progress Telerik Fiddler Classic 弱可执行签名验证漏洞 -
CVE-2026-77804
Progress Telerik Fiddler Classic 根证书安装TOCTOU竞争漏洞 -
CVE-2026-77803
Progress Telerik Fiddler Classic 前端不同步漏洞 -
CVE-2026-86158
Progress Telerik Fiddler Everywhere .NET后端缺少身份验证漏洞
V. Comments for CVE-2026-77802
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