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

CVSS 9.1 · Critical EPSS 0.39% · P30

Possible ATT&CK Techniques 1AI

T1071.001 · Web Protocols

Affected Version Matrix 2

VendorProductVersion RangeStatus
tinyproxytinyproxy≤ 1.11.3affected
364cdb67e0ea00a8e4a7037e2693e0711e816adbunaffected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
tinyproxytinyproxy 0 ~ 1.11.3 -

II. Public POCs for CVE-2026-54388

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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-2026-543879.1 CRITICALTinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
CVE-2026-552028.2 HIGHTinyproxy - 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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