CVE-2020-6817

bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS)

High · published February 16, 2023

CVSS v3.1
7.5
EPSS
1%
Percentile
53.3
In the wild
Unconfirmed
What it is

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']}).

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00718 · 53.3th percentile
Published
2023-02-16T00:00Z
EPSS history
Timeline
  • 16 FEB 00:00Z
    bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS)
    cvelistv5