mitmproxy has an LDAP Injection
Impact
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.
Patches
The vulnerability has been fixed in mitmproxy 12.2.2 and above.
Acknowledgements
We thank Yue (Knox) Liu (@yueyueL) for responsibly disclosing this vulnerability to the mitmproxy team.
Timeline
- 2025-12-08: Received initial report.
- 2025-12-09: Verified report and confirmed receipt.
- 2026-01-02: Informed researcher that patch will be part of the next regular patch release.
- 2026-04-12: Published patch release and advisory.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | mitmproxy | < 12.2.2 | 12.2.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-90- Platform
- Python (PyPI)
- Package
mitmproxy- Disclosed
- 14.04.2026
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-92 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-527g-3w9m-29hv - CC BY 4.0
Vulnerability history: mitmproxy
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 07.2018 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 1
- Medium 2
Disclosures per year
- 2018: 1
- 2019: 0
- 2020: 0
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 1
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