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attributes could result in a regular expression denial of service (ReDoS).\n\nCalls to ``bleach.clean`` with an allowed tag with an allowed ``style`` attribute are vulnerable to ReDoS. For example, ``bleach.clean(..., attributes={'a': ['style']})``.\n\n### Patches\n\n3.1.4\n\n### Workarounds\n\n* do not whitelist the style attribute in `bleach.clean` calls\n\n* limit input string length\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=1623633\n* https://www.regular-expressions.info/redos.html\n* https://blog.r2c.dev/posts/finding-python-redos-bugs-at-scale-using-dlint-and-r2c/\n* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6817\n\n### Credits\n\n* Reported by schwag09 of r2c\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Open an issue at https://github.com/mozilla/bleach/issues\n* Email us at security@mozilla.org", "edition": 4, "modified": "2020-06-17T16:13:30", "published": "2020-03-30T19:45:56", "id": "GHSA-VQHP-CXGC-6WMM", "href": "https://github.com/advisories/GHSA-vqhp-cxgc-6wmm", "title": "regular expression denial-of-service (ReDoS) in Bleach", "type": "github", "cvss": {"score": 0.0, "vector": "NONE"}}], "debian": [{"lastseen": "2020-08-12T01:06:50", "bulletinFamily": "unix", "cvelist": ["CVE-2020-6802"], "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4636-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nFebruary 28, 2020 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : python-bleach\nCVE ID : CVE-2020-6802\nDebian Bug : 951907\n\nIt was reported that python-bleach, a whitelist-based HTML-sanitizing\nlibrary, is prone to a mutation XSS vulnerability in bleach.clean when\n'noscript' and one or more raw text tags were whitelisted.\n\nFor the stable distribution (buster), this problem has been fixed in\nversion 3.1.1-0+deb10u1.\n\nWe recommend that you upgrade your python-bleach packages.\n\nFor the detailed security status of python-bleach please refer to its\nsecurity tracker page at:\nhttps://security-tracker.debian.org/tracker/python-bleach\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n", "edition": 8, "modified": "2020-02-28T21:07:21", "published": "2020-02-28T21:07:21", "id": "DEBIAN:DSA-4636-1:9195A", "href": "https://lists.debian.org/debian-security-announce/debian-security-announce-2020/msg00039.html", "title": "[SECURITY] [DSA 4636-1] python-bleach security update", "type": "debian", "cvss": {"score": 4.3, "vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N"}}, {"lastseen": "2020-08-12T00:58:27", "bulletinFamily": "unix", "cvelist": ["CVE-2020-6817"], "description": "Package : python-bleach\nVersion : 1.4-1+deb8u1\nCVE ID : CVE-2020-6817\nDebian Bug : 955388\n\n\nA vulnerability was discovered in python-bleach, a whitelist-based\nHTML-sanitizing library. Calls to bleach.clean with an allowed tag with\nan allowed style attribute are vulnerable to a regular expression denial\nof service (ReDoS).\n\nFor Debian 8 "Jessie", this problem has been fixed in version\n1.4-1+deb8u1.\n\nWe recommend that you upgrade your python-bleach packages.\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://wiki.debian.org/LTS\n", "edition": 7, "modified": "2020-04-01T17:53:49", "published": "2020-04-01T17:53:49", "id": "DEBIAN:DLA-2167-1:21AF1", "href": "https://lists.debian.org/debian-lts-announce/2020/debian-lts-announce-202004/msg00001.html", "title": "[SECURITY] [DLA 2167-1] python-bleach security update", "type": "debian", "cvss": {"score": 0.0, "vector": "NONE"}}], "suse": [{"lastseen": "2020-03-09T20:34:29", "bulletinFamily": "unix", "cvelist": ["CVE-2020-6802"], "description": "This update for python-bleach to version 3.1.1 fixes the following issue:\n\n - Python-bleach was updated to 3.1.1\n - CVE-2020-6802: Fixed mutation XSS vulnerabilities (boo#1165303).\n\n This update was imported from the openSUSE:Leap:15.1:Update update project.\n\n", "edition": 1, "modified": "2020-03-09T18:20:09", "published": "2020-03-09T18:20:09", "id": "OPENSUSE-SU-2020:0325-1", "href": "http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00018.html", "title": "Security update for python-bleach (important)", "type": "suse", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2020-03-07T18:34:15", "bulletinFamily": "unix", "cvelist": ["CVE-2020-6802"], "description": "This update for python-bleach to version 3.1.1 fixes the following issue:\n\n - Python-bleach was updated to 3.1.1\n - CVE-2020-6802: Fixed mutation XSS vulnerabilities (boo#1165303).\n\n", "edition": 1, "modified": "2020-03-07T15:10:44", "published": "2020-03-07T15:10:44", "id": "OPENSUSE-SU-2020:0308-1", "href": "http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00013.html", "title": "Security update for python-bleach (important)", "type": "suse", "cvss": {"score": 0.0, "vector": "NONE"}}], "freebsd": [{"lastseen": "2020-04-26T20:52:45", "bulletinFamily": "unix", "cvelist": ["CVE-2020-6817"], "description": "\nBleach developers reports:\n\nbleach.clean behavior parsing style attributes could result in a\n\t regular expression denial of service (ReDoS).\nCalls to bleach.clean with an allowed tag with an allowed style\n\t attribute are vulnerable to ReDoS. 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