🛡️ CVE-2026-31842 — tinyproxy

🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-444 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-31842 is classified as CWE-444: HTTP Request Smuggling. A proxy and a server disagree on where one request ends, letting an attacker slip a second request past the front end.

Affected software

CVE-2026-31842 is recorded against 1 package.

  • tinyproxy (fixed in 1.11.3)

Timeline and source

Published on 7 April 2026 and last revised on 10 August 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

datatracker.ietf.org
github.com
github.com

CVE-2026-31842 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-444
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-07
Updated 2026-08-11
Modified 2026-08-10
Fix URL N/A

Affected Packages

Software From version Fixed in
tinyproxy — 1.11.3

Exploit Protection

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CVE-2026-31842 carries CVSS 7.5 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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