CVE-2026-54388

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.1 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N                                    

Vulnerability Description

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.

Vulnerability Details

Published Date

June 17, 2026

Last Modified

June 17, 2026

CWE ID

CWE-444

Source

NVD

Vendor

tinyproxy

Product

tinyproxy

External References

https://github.com/tinyproxy/tinyproxy/commit/364cdb67e0ea00a8e4a7037e2693e0711e816adb
https://github.com/tinyproxy/tinyproxy/issues/609
https://github.com/tinyproxy/tinyproxy/pull/610
https://www.vulncheck.com/advisories/tinyproxy-http-request-smuggling-via-duplicate-content-length-headers

CVE-2026-54388

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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