---
id: CVE-2026-3945
title: >-
  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)
summary: >-
  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 s…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
published: '2026-03-30'
updated: '2026-08-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3945'
references:
  - url: 'https://github.com/tinyproxy/tinyproxy/commit/969852c'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy/commit/bb7edc4'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy/issues/602'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy/pull/603'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy/releases'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
tags:
  - nvd
epss: 0.00579
epssPercentile: 0.46364
ingestedAt: '2026-08-10T12:39:46.420Z'
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.