CVE-2020-6817

Published: Feb 16, 2023Modified: Mar 19, 2025

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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']}).

Affected (1)

Products: Mozilla: Bleach

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Mozilla Bleach	Before 3.1.4

Related CWEs

Inefficient Regular Expression Complexity

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

References (4)

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

Source: security@mozilla.org

ExploitIssue Tracking

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

Source: security@mozilla.org

Vendor Advisory

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

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitIssue Tracking

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

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.