4.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-40606

CVE-2026-40606: ProxyAuth Addon LDAP Injection in mitmproxy

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-40606

CVE-2026-40606:

4.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
mitmproxy	pip	<= 12.2.1	12.2.2

Technical Details

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Root Cause Analysis

The vulnerability is a classic LDAP injection in the proxyauth addon of mitmproxy. The analysis of the patch commit 71c9234057922bc29b9734ec408d712113d294d2 shows that the Ldap class's __call__ method was modified. Prior to the patch, the username from the client was directly used to format an LDAP search filter string. This allowed an attacker to inject special LDAP filter characters (like *, (, )) to alter the logic of the LDAP query, leading to an authentication bypass. The fix involves adding a new make_search_filter method that sanitizes the username by escaping these special characters using the ldap3.utils.conv.escape_filter_chars function before constructing the filter. The Ldap.__call__ function is the vulnerable function as it's the one that takes the untrusted input and uses it in a dangerous way.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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