CVE-2020-6817 Information

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’]).

Reference

https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm https://bugzilla.mozilla.org/show_bug.cgi?id=1623633