CVE-2026-54387
Critical · 9.1CVSS
9.1
EPSS
0.7%
Published
Jun 17, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | tinyproxy | 0 | 1.11.3-3.1 |
Related vulnerabilities
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- CVE-2026-54388 Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing… Also affects tinyproxy
- CVE-2026-3945 An integer overflow vulnerability in the HTTP chunked transfer encoding parser in… Also affects tinyproxy
- CVE-2017-11747 main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after… Also affects tinyproxy
- CVE-2026-112212 GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before… CWE-444
- CVE-2026-111750 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. CWE-444
- CVE-2026-88829 A flaw was found in BusyBox httpd's reverse proxy feature. CWE-444
- CVE-2026-94439 When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns… CWE-444