HTTP/HTTPS Traffic Interception Bypass in mad-proxy

published 2025-12-09 10 mo ago modified 2026-10-14 25 d ago also GHSA-wx63-35hw-2482 , PYSEC-2026-1596 , EUVD-2025-202176

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

mad-proxy is a Python-based HTTP/HTTPS proxy server for detection and blocking of malicious web activity using custom security policies. Versions 0.3 and below allow attackers to bypass HTTP/HTTPS traffic interception rules, potentially exposing sensitive traffic. This issue does not have a fix at the time of publication.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 10 mo ago (2025-12-10)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	mad-proxy	<=0.3	no fix listed

Affected products

machphy mad-proxy

Classification

Weakness

CWE-693 Protection Mechanism Failure

References

github.com /machphy/mad-proxy/security/advisories/GHSA-wx63-35hw-2482
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2025-67485
advisory
github.com /machphy/mad-proxy
package
pypi.org /project/mad-proxy
package
github.com /advisories/GHSA-wx63-35hw-2482
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary