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

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1AI

T1071.001 · Web Protocols
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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)

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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