VulnerabilityAnalyzed

CVE-2026-40606

This allows a malicious client to bypass authentication.

MEDIUM 4.8EPSS 0.17%

Does this matter?

Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS: 0.17% probability · 6th percentile
CISA KEV: Not listed
Weakness: CWE-90
Affected: mitmproxy/mitmproxy
Source: security-advisories@github.com

References

https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hvVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.