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Debian Security Advisory DSA-4892-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
April 18, 2021                        https://www.debian.org/security/faq
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Package        : python-bleach
CVE ID         : CVE-2021-23980
Debian Bug     : 986251

It was reported that python-bleach, a whitelist-based HTML-sanitizing
library, is prone to a mutation XSS vulnerability in bleach.clean when
'svg' or 'math' are in the allowed tags, 'p' or 'br' are in allowed
tags, 'style', 'title', 'noscript', 'script', 'textarea', 'noframes',
'iframe', or 'xmp' are in allowed tags and 'strip_comments=False' is
set.

For the stable distribution (buster), this problem has been fixed in
version 3.1.2-0+deb10u2.

We recommend that you upgrade your python-bleach packages.

For the detailed security status of python-bleach please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/python-bleach

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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