Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1325 CNY

100%
Buy Us a Coffee

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

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1AI

T1102 · Web Service
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-54387

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
Source: NVD (National Vulnerability Database)
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: 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-2026-54387

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-54387

请登录查看更多情报信息。

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-2026-543889.1 CRITICALTinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers
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-2026-54387

No comments yet

Leave a comment