Tinyproxy Tinyproxy vulnerabilities

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Published CVEs affecting Tinyproxy Tinyproxy: 4 record(s), with affected versions and fixes.

CVE-2026-55202 High · 8.2 CWE-290 Jun 17, 2026

Tinyproxy - Stathost Detection Bypass via Host Header Manipulation

Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation. Remote attackers can trigger unauthorized access to internal proxy statistics or misroute requests as transparent proxy connections to circumvent access controls.

CVE-2026-54388 Critical · 9.1 CWE-444 Jun 17, 2026

Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers

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.

CVE-2026-54387 Critical · 9.1 CWE-444 Jun 17, 2026

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 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.

CVE-2026-3945 High · 7.5 CWE-190 Mar 30, 2026

tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service

An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).