Bug 1820616 (CVE-2020-6817) - CVE-2020-6817 python-bleach: behavior parsing style attributes could result in a regular expression denial of service (ReDoS)
Summary: CVE-2020-6817 python-bleach: behavior parsing style attributes could result i...
Alias: CVE-2020-6817
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1820624 1820625
TreeView+ depends on / blocked
Reported: 2020-04-03 13:10 UTC by Michael Kaplan
Modified: 2020-04-03 16:31 UTC (History)
2 users (show)

Fixed In Version: python-bleach 3.1.4
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Clone Of:
Last Closed: 2020-04-03 16:31:57 UTC

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Description Michael Kaplan 2020-04-03 13:10:30 UTC
Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

Comment 1 Michael Kaplan 2020-04-03 13:26:47 UTC
Upstream Reference:


Comment 2 Michael Kaplan 2020-04-03 13:27:16 UTC
Created python-bleach tracking bugs for this issue:

Affects: epel-all [bug 1820624]
Affects: fedora-all [bug 1820625]

Comment 3 Product Security DevOps Team 2020-04-03 16:31:57 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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