Mitmweb in mitmproxy allows DNS Rebinding attacks

published 2018-07-22 8 y ago modified 2026-06-17 4 mo ago also GHSA-6m53-c78q-7qmg , PYSEC-2018-56 , EUVD-2018-0100

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.3%; EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits: 0; none known

mitmweb in mitmproxy v4.0.3 allows DNS Rebinding attacks, related to tools/web/app.py.

Patch / fix

fixed in 1 distros 1 links 2

pypi mitmproxy 4.0.4

mitmproxy Debian 14, Debian 12 3.0.4-1

debian advisories DEBIAN-CVE-2018-14505

github.com/mitmproxy/mitmproxy@7f464b8 commit
github.com/mitmproxy/mitmproxy#3243 pull request

Exploit prediction

3.35% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/mitmproxy/mitmproxy/issues/3234 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	mitmproxy	<4.0.4	4.0.4

Classification

Weakness

CWE-20 Improper Input Validation

References

github.com /mitmproxy/mitmproxy/pull/3243
web, third-party-advisory
github.com /mitmproxy/mitmproxy/commit/7f464b89296881f4d9ec032378c4418e832d17e3
web
github.com /mitmproxy/mitmproxy/issues/3234
web, exploit, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2018-14505
advisory
github.com /advisories/GHSA-6m53-c78q-7qmg
advisory
github.com /mitmproxy/mitmproxy
package
github.com /pypa/advisory-database/tree/main/vulns/mitmproxy/PYSEC-2018-56.yaml
web

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