Bleach is an allowed-list-based HTML sanitizing library that escapes or stripsmarkup and attributes.Bleach can also linkify text safely, applying filters that Django’s urlizefilter cannot, and optionally setting rel attributes, even on links alreadyin the text.Bleach is intended for sanitizing text from untrusted sources. If you findyourself jumping through hoops to allow your site administrators to do lots ofthings, you’re probably outside the use cases. Either trust those users, ordon’t.Because it relies on, Bleach is as good as modern browsers at dealingwith weird, quirky HTML fragments. And any of Bleach’s methods will fixunbalanced or mis-nested tags.The version on is the most up-to-date and contains the latest bugfixes. You can find full documentation on.
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Code:Documentation:Issue tracker:License: Apache License v2; see LICENSE file. Version 3.1.2 (March 11th, 2020)Security fixes.bleach.clean behavior parsing embedded MathML and SVG contentwith RCDATA tags did not match browser behavior and could result ina mutation XSS.Calls to bleach.clean with strip=False and math orsvg tags and one or more of the RCDATA tags script,noscript, style, noframes, iframe, noembed, orxmp in the allowed tags whitelist were vulnerable to a mutationXSS.This security issue was confirmed in Bleach version v3.1.1. Earlierversions are likely affected too.Anyone using Bleach. Version 3.1.1 (February 13th, 2020)Security fixes.bleach.clean behavior parsing noscript tags did not matchbrowser behavior.Calls to bleach.clean allowing noscript and one or more ofthe raw text tags ( title, textarea, script, style,noembed, noframes, iframe, and xmp) were vulnerableto a mutation XSS.This security issue was confirmed in Bleach versions v2.1.4, v3.0.2,and v3.1.0.
Earlier versions are probably affected too.Anyone using Bleach. Version 3.1.0 (January 9th, 2019)Security fixesNoneBackwards incompatible changesNoneFeatures.
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Add recognizedtags argument to the linkify Linker class. Thisfixes issues when linkifying on its own and having some tags get escaped.It defaults to a list of HTML5 tags. Thank you, Chad Birch!
(#409)Bug fixes. Add six=1.9 to requirements. Thank you, Dave Shawley (#416). Fix cases where attribute names could have invalid characters in them.(#419). Fix problems with LinkifyFilter not being able to match linksacross &. (#422).
Fix InputStreamWithMemory when the BleachHTMLParser isparsing meta tags. (#431). Fix doctests. Version 2.1.3 (March 5th, 2018)Security fixes.Attributes that have URI values weren’t properly sanitized if thevalues contained character entities. Using character entities, itwas possible to construct a URI value with a scheme that was notallowed that would slide through unsanitized.This security issue was introduced in Bleach 2.1. Anyone usingBleach 2.1 is highly encouraged to upgrade.Backwards incompatible changesNoneFeaturesNoneBug fixes. Fixed some other edge cases for attribute URI value sanitizing andimproved testing of this code.
Version 2.0 (March 8th, 2017)Security fixes. NoneBackwards incompatible changes.Removed support for Python 2.6. #206.Removed support for Python 3.2.
#224.Bleach no longer supports html5lib traversing - serializing process. Because ofthat, there are some differences in clean’s output as compared with previousversions.Amongst other things, this version will add end tags even if the tag inquestion is to be escaped.bleach.clean and friends attribute callables now take three arguments:tag, attribute name and attribute value.
Previously they only took attributename and attribute value.All attribute callables will need to be updated.bleach.linkify was rewrittenlinkify was reimplemented as an html5lib Filter. As such, it no longeraccepts a tokenizer argument.The callback functions for adjusting link attributes now takes a namespacedattribute.Previously you’d do something like this: def checkprotocol(attrs, isnew):if not attrs.get('href', ').startswith('http:', 'https:')):return Nonereturn attrsNow it’s more like this: def checkprotocol(attrs, isnew):if not attrs.get((None, u'href'), u').startswith(('http:', 'https:')):# ^^^^^^^^^^^^^^^return Nonereturn attrsFurther, you need to make sure you’re always using unicode values. Version 1.5 (November 4th, 2016)Security fixes. NoneBackwards incompatible changes.clean: The list of ALLOWEDPROTOCOLS now defaults to http, https andmailto.Previously it was a long list of protocols something like ed2k, ftp, http,https, irc, mailto, news, gopher, nntp, telnet, webcal, xmpp, callto, feed,urn, aim, rsync, tag, ssh, sftp, rtsp, afs, data. #149Changes. clean: Added protocols to arguments list to let you override the list ofallowed protocols.
Thank you, Andreas Malecki! #149. linkify: Fix a bug involving periods at the end of an email address. Thank you,Lorenz Schori! #219.
linkify: Fix linkification of non-ascii ports. Thank you Alexandre, Macabies!#207. linkify: Fix linkify inappropriately removing node tails when dropping nodes.#132. Fixed a test that failed periodically. #161. Switched from nose to py.test.
#204. Add test matrix for all supported Python and html5lib versions. #230. Limit to html5lib =0.999,!=0.9999,!=0.99999. Version 1.2 (January 28, 2013). linkify has changed considerably. Many keyword arguments have beenreplaced with a single callbacks list.
Please see the documentation for moreinformation. Bleach will no longer consider unacceptable protocols when linkifying. linkify now takes a tokenizer argument that allows it to skipsanitization. delinkify is gone. Removed exception handling from render. Clean and linkify maynow throw.
linkify correctly ignores case for protocols and domain names. linkify correctly handles markup within an tag.
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