VULNERABILITY INTELLIGENCE

CVE-2020-6817

CVSS score7.5 HIGH
EPSS probability0.72%
CISA KEVNot currently listed
Published2023-02-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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']}).

Weakness classification

  • CWE-1333: Inefficient Regular Expression Complexity

Primary references