---
id: CVE-2026-31842
title: >-
  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
summary: >-
  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 a…
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-444
vendor: tinyproxy_project
product: tinyproxy
affected:
  - tinyproxy <= 1.11.3
published: '2026-04-07'
updated: '2026-08-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-31842'
references:
  - url: 'https://datatracker.ietf.org/doc/html/rfc7230'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/tinyproxy/tinyproxy/issues/604'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
tags:
  - nvd
epss: 0.00743
epssPercentile: 0.52768
ingestedAt: '2026-08-10T12:39:46.453Z'
---

## Overview

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.

## Affected

- `tinyproxy <= 1.11.3`

## Remediation

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