CVE-2026-54387 — Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
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 …
Published: 2026-06-17 · CVSS: 9.3 · CVSS 4.0
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: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7