CVE-2020-6817

HIGH

Mozilla Bleach < 3.1.4 - Denial of Service

Title source: rule

Description

bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

References (2)

Core 2

Core References

Exploit, Issue Tracking

https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

Vendor Advisory

https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm

Scores

CVSS v3 7.5

EPSS 0.0058

EPSS Percentile 69.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-1333

Status published

Products (2)

mozilla/bleach < 3.1.4

pypi/bleach 0 - 3.1.4PyPI

Published Feb 16, 2023

Tracked Since Feb 18, 2026