Is this vulnerability remotely exploitable, and by whom?

Yes. Any remote client that can send HTTP requests through a vulnerable Tinyproxy instance can attempt to exploit this desynchronization. No special privileges are required beyond network reachability of the proxy.

Does exploitation require authentication or a man-in-the-middle position?

No authentication is required at the protocol level for exploitation; a standard HTTP client is sufficient. A man-in-the-middle position is not necessary—the attacker simply needs to originate requests that pass through Tinyproxy.

What is the safest general fix pattern for developers maintaining a proxy or HTTP intermediary?

Adopt a strict, spec-compliant HTTP parsing model: normalize header names and token values to a canonical case before comparison; implement case-insensitive comparisons where mandated by the RFC; and enforce unambiguous framing rules, rejecting requests that violate or abuse `Transfer-Encoding` and `Content-Length` semantics.

Severity:

HIGH RISK

(7.5)

HTTP Request Parsing Desynchronization (CWE-444) in Tinyproxy Transfer-Encoding Handling

CVE-2026-31842

Published:

Apr 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

HTTP Request Smuggling / Desynchronization

CWE:

CWE-444

Impact:

Denial of Service and Security Control Bypass

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

HTTP Request Smuggling / Desynchronization

CWE:

CWE-444

Impact:

Denial of Service and Security Control Bypass

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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HTTP Request Parsing Desynchronization (CWE-444) in Tinyproxy Transfer-Encoding Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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