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CVE-2026-40606

ProxyAuth Addon LDAP Injection in mitmproxy

4.8 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.17%Up 0.1 points since Apr 22, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.8

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.

Record
CVE-2026-40606
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
EUVDEUVD-2026-24215 4.8

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.

Record
EUVD-2026-24215
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-527g-3w9m-29hv 4.8

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.
Record
GHSA-527g-3w9m-29hv
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
NVD 4.8

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.

Record
CVE-2026-40606
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSV 4.8

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.

Record
CVE-2026-40606
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSVDEBIAN-CVE-2026-40606 4.8

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.

Record
DEBIAN-CVE-2026-40606
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-527g-3w9m-29hv 4.8

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.
Record
GHSA-527g-3w9m-29hv
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-90
Updated
2026-11-02
OSVPYSEC-2026-92 4.8

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.

Record
PYSEC-2026-92
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-40606 4.8

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.

Record
UBUNTU-CVE-2026-40606
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2026:10622-1 No score

python313-mitmproxy-12.2.2-1.1 on GA media

These are all security issues fixed in the python313-mitmproxy-12.2.2-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10622-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mitmproxy
PyPI
 through 12.2.1
12.2.2
mitmproxy
Debian:12
 All versions, plus listed versions
8.1.1-28.1.1-38.1.1-4
 None known
mitmproxy
Debian:14
 All versions, plus listed versions
0.10-10.10-20.10.1-10.10.1-20.11.3-1
Show 45 moreShow less
0.11.3-20.11.3-30.12.1-10.12.1-20.13-10.15-10.15-20.18.1-10.18.1-20.18.2-10.18.2-20.18.2-30.18.2-40.18.2-50.18.2-60.6-10.6-20.6-30.7-10.8-10.8-20.9.1-10.9.1-20.9.2-10.9.2-22.0.2-12.0.2-22.0.2-32.0.2-43.0.3-13.0.4-14.0.4-14.0.4-24.0.4-34.0.4-44.0.4-54.0.4-64.0.4-6.15.1.1-15.1.1-25.3.0-15.3.0-25.3.0-36.0.2-16.0.2-2
 None known
mitmproxy
PyPI
 before 12.2.2, plus listed versions
0.100.10.10.110.11.10.11.2
Show 45 moreShow less
0.11.30.12.00.12.10.130.14.00.150.160.170.18.10.18.20.18.30.80.8.10.90.9.10.9.21.0.01.0.11.0.210.0.010.1.010.1.110.1.210.1.310.1.410.1.510.1.610.2.010.2.110.2.210.2.310.2.410.3.010.3.110.4.010.4.110.4.211.0.011.0.111.0.211.1.011.1.211.1.312.0.012.0.1
12.2.2
mitmproxy
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.11.3-30.12.1-20.13-10.15-1
 None known
mitmproxy
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.0.2-22.0.2-3
 None known
mitmproxy
Ubuntu:20.04:LTS
 All versions, plus listed versions
4.0.4-64.0.4-6.1
 None known
mitmproxy
Ubuntu:22.04:LTS
 All versions, plus listed versions
6.0.2-1
 None known
mitmproxy
Ubuntu:24.04:LTS
 All versions, plus listed versions
8.1.1-2
 None known
mitmproxy
Ubuntu:25.10
 All versions, plus listed versions
8.1.1-28.1.1-3
 None known
mitmproxy
Ubuntu:26.10
 All versions, plus listed versions
8.1.1-4
 None known
mitmproxy
Ubuntu:26.04:LTS
 All versions, plus listed versions
8.1.1-38.1.1-4
 None known
python-mitmproxy
openSUSE:Tumbleweed
 before 12.2.2-1.1
12.2.2-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40606 is a medium vulnerability (CVSS 4.8) in Mitmproxy, published April 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 5th percentile. Fixed in mitmproxy 12.2.2.

References

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