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CVE-2026-54388— Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers

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，该漏洞源于未正确拒绝包含多个不同值Content-Length标头的请求，可能导致远程攻击者通过注入任意HTTP请求实现缓存中毒、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

T1071.001 · Web Protocols

Affected Version Matrix 2

VendorProduct Version RangeStatus
tinyproxy tinyproxy ≤ 1.11.3 affected
364cdb67e0ea00a8e4a7037e2693e0711e816adb unaffected
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I. Basic Information for CVE-2026-54388

Vulnerability Information
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Vulnerability Title
Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers
Source: CVE Program / CVE List V5
Vulnerability Description
Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value 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，该漏洞源于未正确拒绝包含多个不同值Content-Length标头的请求，可能导致远程攻击者通过注入任意HTTP请求实现缓存中毒、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-2026-54388

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8956 chars
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III. Intelligence Information for CVE-2026-54388

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Patches & Fixes for CVE-2026-54388 (2)

Vendor Advisories for CVE-2026-54388 (1)

News Coverage for CVE-2026-54388 (1)

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

CVE-2026-54387 9.1 CRITICAL Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
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-2026-54388

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