← Vulnerability feed

Vulnerability record · CVE-2026-54387 · published 17 June 2026

CVE-2026-54387: HTTP request smuggling vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.68% · top 49.8% CWE-444 · HTTP request smuggling Deferred
9.3CVSS 4.0 base score
0.68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/tinyproxy/tinyproxy/commit/ff45d3bf0e61d0f8ed97ab379d3047f04eb67521
https://github.com/tinyproxy/tinyproxy/issues/609
https://github.com/tinyproxy/tinyproxy/pull/610
https://www.vulncheck.com/advisories/tinyproxy-http-request-smuggling-via-cl-te-desynchronization

Track CVE-2026-54387 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2026-48710Starlette Host header validation flaw enables request.url path mismatchStarlette before 1.0.1 did not validate the HTTP Host header before using it to rebuild request.url, so a malformed Host value could make request.url…KEVEPSS 7.1%analysed7.5CVE-2025-61884Oracle E-Business Suite Configurator pre-auth data exposure flawOracle Configurator in Oracle E-Business Suite 12.2.3 through 12.2.14 exposes a vulnerability reachable over HTTP without authentication. A successfu…KEVEPSS 96%analysed9.9CVE-2023-48365Qlik Sense Enterprise HTTP Request Smuggling Enables Unauthenticated RCEQlik Sense Enterprise for Windows before August 2023 Patch 2 fails to properly validate HTTP headers, allowing HTTP request tunneling to the backend …KEVEPSS 47%analysed9.9CVE-2023-41265Qlik Sense Enterprise HTTP request tunneling privilege escalationQlik Sense Enterprise for Windows fails to properly handle raw HTTP requests, allowing request tunneling that reaches the backend repository applicat…KEVEPSS 88%analysed10.0CVE-2022-22536SAP NetWeaver and Web Dispatcher HTTP request smugglingSAP NetWeaver Application Server ABAP, NetWeaver Application Server Java, ABAP Platform, Content Server 7.53 and Web Dispatcher mishandle HTTP reques…KEVEPSS 98%analysed

Source: NIST National Vulnerability Database (record CVE-2026-54387), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.