mitmproxy up to 12.2.1 ldap injection

Summaryinfo

A vulnerability identified as problematic has been detected in mitmproxy up to 12.2.1. This issue affects some unknown processing. This manipulation causes ldap injection. The identification of this vulnerability is CVE-2026-40606. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in mitmproxy up to 12.2.1. It has been declared as problematic. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a ldap injection vulnerability. The CWE definition for the vulnerability is CWE-90. The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface for mitmproxy. In mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication. Only mitmproxy instances using the proxyauth option with LDAP are affected. This option is not enabled by default. The vulnerability has been fixed in mitmproxy 12.2.2 and above.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-40606 since 04/14/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 309096 (Linux Distros Unpatched Vulnerability : CVE-2026-40606), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 12.2.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (309096). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Name

• mitmproxy

Version

• 12.2.0
• 12.2.1

Website

• Product: https://github.com/mitmproxy/mitmproxy/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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