CVE-2026-31842
Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling
- State
- Published
- Severity
- 8.7 High
- Published
- Apr 7, 2026
- Updated
- Aug 10, 2026
- Reserved
- Mar 9, 2026
Description
Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The is_chunked_transfer function uses strcmp to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | TuranSec |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | TuranSec |
| 2.0 | 7.8 High | AV:N/AC:L/Au:N/C:N/I:N/A:C | TuranSec |
Weaknesses
- CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Products
| Product | Versions |
|---|---|
TinyproxyTinyproxy Project |
|
References
- Upstream issue report and reproduction detailsissue-trackingtechnical-descriptionthird-party-advisory
- Tinyproxy upstream projectproduct
- RFC 7230: transfer-coding names are case-insensitivetechnical-description
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