CVE-2026-54387 Details
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.
A vulnerability in Tinyproxy versions through 1.11.3 allows for HTTP request smuggling due to improper handling of conflicting Content-Length and Transfer-Encoding: chunked headers. Tinyproxy forwards both headers to the backend while using Content-Length to determine the size of the request body. This desynchronization can be exploited by remote attackers to inject arbitrary HTTP requests to the backend, potentially leading to cache poisoning, access control bypass, and request hijacking.
Users can update to Tinyproxy version 1.11.4 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 17, 2026CISA-ADP
Assessed Jun 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/tinyproxy/tinyproxy/commit/ff45d3bf0e61d0f8ed97ab379d3047f04eb67521 | [email protected] | Source CodeVendor |
| https://github.com/tinyproxy/tinyproxy/issues/609 | [email protected] | ExploitIssue TrackingTechnical AnalysisVendor |
| https://github.com/tinyproxy/tinyproxy/pull/610 | [email protected] | Issue TrackingVendor |
| https://www.vulncheck.com/advisories/tinyproxy-http-request-smuggling-via-cl-te-desynchronization | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-444 | Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Tinyproxy | <= 1.11.3 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 18, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | New CVE Received | [email protected] |