CVE-2026-40606
Medium
Description
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.
SeverityMedium
CVSS4.8
Exploit probability—
ProductMitmproxy
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-90CWE-90
How to fix
Update
- mitmproxy mitmproxy12.2.2 or later
- mitmproxy12.2.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mitmproxy mitmproxy | v < 12.2.2 | 12.2.2 |
| mitmproxyPyPI | v < 12.2.2 | 12.2.2 |
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