CVE-2026-3945
tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service
- State
- Published
- Severity
- 8.7 High
- Published
- Mar 30, 2026
- Updated
- Aug 10, 2026
- Reserved
- Mar 11, 2026
Description
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).
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-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
tinyproxytinyproxy |
|
References
- https://github.com/tinyproxy/tinyproxy/issues/602issue-trackingtechnical-description
- https://github.com/tinyproxy/tinyproxy/pull/603patch
- https://github.com/tinyproxy/tinyproxy/commit/969852cpatch
- https://github.com/tinyproxy/tinyproxy/commit/bb7edc4patch
- https://github.com/tinyproxy/tinyproxy/releasesrelease-notes
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