CVE-2020-6817

CWE-1333CWE-400 — Uncontrolled Resource Consumption11 documents7 sources
Severity
7.5HIGH
EPSS
0.6%
top 31.09%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla Mozilla BleachMozilla Bleach
Timeline
PublishedFeb 16
Latest updateMar 5

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']}).

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶PyPIbleach< 3.1.4
▶NVDmozilla/bleach< 3.1.4
▶CVEListV5mozilla/mozilla_bleachunspecified — 3.1.4
▶Debianpython-bleach< 3.1.4-1+3

🔴Vulnerability Details

5
OSV
CVE-2020-6817: bleach↗2023-02-16
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CVEList
CVE-2020-6817: bleach↗2023-02-16
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OSV
regular expression denial-of-service (ReDoS) in Bleach↗2020-03-30
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OSV
CVE-2020-6817: In Mozilla Bleach before 3↗2020-03-30
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GHSA
regular expression denial-of-service (ReDoS) in Bleach↗2020-03-30
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📋Vendor Advisories

2
Ubuntu
Bleach vulnerabilities↗2026-03-05
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Debian
CVE-2020-6817: python-bleach - bleach.clean behavior parsing style attributes could result in a regular express...↗2020
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💬Community

3
Bugzilla
CVE-2020-6817 python-bleach: behavior parsing style attributes could result in a regular expression denial of service (ReDoS) [epel-all]↗2020-04-03
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Bugzilla
CVE-2020-6817 python-bleach: behavior parsing style attributes could result in a regular expression denial of service (ReDoS)↗2020-04-03
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Bugzilla
CVE-2020-6817 python-bleach: behavior parsing style attributes could result in a regular expression denial of service (ReDoS) [fedora-all]↗2020-04-03
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CVE-2020-6817 (HIGH CVSS 7.5) | bleach.clean behavior parsing style | cvebase.io