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CVE-2026-54387— Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization

Quick assessment

Affected
tinyproxy tinyproxy
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tinyproxy是Tinyproxy团队开源的一个小型、高效的 HTTP/SSL 代理守护程序。 tinyproxy 1.11.3及之前版本存在输入验证错误漏洞，该漏洞源于无法调和冲突的Content-Length和Transfer-Encoding: chunked标头，将两者原样转发到后端，同时使用Content-Length确定消耗的请求体字节数，远程攻击者可以解除代理和后端解析器状态的同步，允许向后端注入任意HTTP请求，从而实施缓存投毒、访问控制绕过和请求劫持。

CVSS 9.1 · Critical EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1102 · Web Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
tinyproxy tinyproxy ≤ 1.11.3 affected
ff45d3bf0e61d0f8ed97ab379d3047f04eb67521 unaffected
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I. Basic Information for CVE-2026-54387

Vulnerability Information
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Vulnerability Title
Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyproxy through 1.11.3, fixed in commit ff45d3b, fails to reconcile conflicting Content-Length and Transfer-Encoding: chunked headers, forwarding both verbatim to the backend while using Content-Length to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
tinyproxy 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tinyproxy是Tinyproxy团队开源的一个小型、高效的 HTTP/SSL 代理守护程序。 tinyproxy 1.11.3及之前版本存在输入验证错误漏洞，该漏洞源于无法调和冲突的Content-Length和Transfer-Encoding: chunked标头，将两者原样转发到后端，同时使用Content-Length确定消耗的请求体字节数，远程攻击者可以解除代理和后端解析器状态的同步，允许向后端注入任意HTTP请求，从而实施缓存投毒、访问控制绕过和请求劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinyproxy tinyproxy 0 ~ 1.11.3 -

II. Public POCs for CVE-2026-54387

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7919 chars
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III. Intelligence Information for CVE-2026-54387

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Patches & Fixes for CVE-2026-54387 (2)

Vendor Advisories for CVE-2026-54387 (1)

News Coverage for CVE-2026-54387 (1)

Same Patch Batch · tinyproxy · 2026-06-17 · 3 CVEs total

CVE-2026-54388 9.1 CRITICAL Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers
CVE-2026-55202 8.2 HIGH Tinyproxy - Stathost Detection Bypass via Host Header Manipulation

IV. Related Vulnerabilities

Same product: tinyproxy
Same vendor: tinyproxy
Same weakness: CWE-444

V. Comments for CVE-2026-54387

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