Backwards incompatible changes

• Dropped support for Python 3.9. (#756)

Security fixes

None

Bug fixes

• Add support for Python 3.14. (#758)
• Fix wbr handling. (#488)

Backwards incompatible changes

• Dropped support for Python 3.8. (#737)

Security fixes

None

Bug fixes

• Add support for Python 3.13. (#736)
• Remove six depdenncy. (#618)
• Update known-good versions for tinycss2. (#732)
• Fix additional < followed by characters and EOF issues. (#728)

Backwards incompatible changes

• Dropped support for Python 3.7. (#709)

Security fixes

None

Bug fixes

• Add support for Python 3.12. (#710)
• Fix linkify with arrays in querystring (#436)
• Handle more cases with < followed by character data (#705)
• Fix entities inside a tags in linkification (#704)
• Update cap for tinycss2 to <1.3 (#702)
• Updated Sphinx requirement
• Add dependabot for github actions and update github actions

Backwards incompatible changes

• bleach.clean, bleach.sanitizer.Cleaner,
  bleach.html5lib_shim.BleachHTMLParser: the tags and protocols
  arguments were changed from lists to sets.

  Old pre-6.0.0:

  .. code-block:: python

  bleach.clean(
  "some text",
  tags=["a", "p", "img"],
  # ^ ^ list
  protocols=["http", "https"],
  # ^ ^ list
  )

  New 6.0.0 and later:

  .. code-block:: python

  bleach.clean(
  "some text",
  tags={"a", "p", "img"},
  # ^ ^ set
  protocols={"http", "https"},
  # ^ ^ set
  )

• bleach.linkify, bleach.linkifier.Linker: the skip_tags and
  recognized_tags arguments were changed from lists to sets.

  Old pre-6.0.0:

  .. code-block:: python

  bleach.linkify(
  "some text",
  skip_tags=["pre"],
  # ^ ^ list
  )

  linker = Linker(
  skip_tags=["pre"],
  # ^ ^ list
  recognized_tags=html5lib_shim.HTML_TAGS + ["custom-element"],
  # ^ ^ ^ list
  # |
  # | list concatenation
  )

  New 6.0.0 and later:

  .. code-block:: python

  bleach.linkify(
  "some text",
  skip_tags={"pre"},
  # ^ ^ set
  )

  linker = Linker(
  skip_tags={"pre"},
  # ^ ^ set
  recognized_tags=html5lib_shim.HTML_TAGS | {"custom-element"},
  # ^ ^ ^ set
  # |
  # | union operator
  )

• bleach.sanitizer.BleachSanitizerFilter: strip_allowed_elements is now
  strip_allowed_tags. We now use "tags" everywhere rather than a mishmash
  of "tags" in some places and "elements" in others.

Security fixes

None

Bug fixes

• Add support for Python 3.11. (#675)

• Fix API weirness in BleachSanitizerFilter. (#649)

  We're using "tags" instead of "elements" everywhere--no more weird
  overloading of "elements" anymore.

  Also, it no longer calls the superclass constructor.

• Add warning when css_sanitizer isn't set, but the style
  attribute is allowed. (#676)

• Fix linkify handling of character entities. (#501)

• Rework dev dependencies to use requirements-dev.txt and
  requirements-flake8.txt instead of extras.

• Fix project infrastructure to be tox-based so it's easier to have CI
  run the same things we're running in development and with flake8
  in an isolated environment.

• Update action versions in CI.

• Switch to f-strings where possible. Make tests parametrized to be
  easier to read/maintain.

Bugs

• Add missing comma to tinycss2 require. Thank you, @shadchin!

• Add url parse tests based on wpt url tests. (#688)

• Support scheme-less urls if "https" is in allow list. (#662)

• Handle escaping < in edge cases where it doesn't start a tag. (#544)

• Fix reference warnings in docs. (#660)

• Correctly urlencode email address parts. Thank you, @larseggert! (#659)

Backwards incompatible changes

• clean and linkify now preserve the order of HTML attributes. Thank
  you, @askoretskly! (#566)

• Drop support for Python 3.6. Thank you, @hugovk! (#629)

• CSS sanitization in style tags is completely different now. If you're using
  Bleach clean to sanitize css in style tags, you'll need to update your
  code and you'll need to install the css extras::

  pip install 'bleach[css]'
  

  See the documentation on sanitizing CSS for how to do it <https://bleach.readthedocs.io/en/latest/clean.html#sanitizing-css>_. (#633)

Bug fixes

• Rework dev dependencies. We no longer have
  requirements-dev.in/requirements-dev.txt. Instead, we're using
  dev extras.

  See development docs <https://bleach.readthedocs.io/en/latest/dev.html>_
  for more details. (#620)

• Add newline when dropping block-level tags. Thank you, @jvanasco! (#369)

• Python 3.9 support

Bug fixes

• Update sanitizer clean to use vendored 3.6.14 stdlib urllib.parse to
  fix test failures on Python 3.9 #536

• Drop support for unsupported Python versions <3.6 #520

Security fixes

None

Features

• fix attribute name in the linkify docs (thanks @CheesyFeet!)

None

Features

• add more tests for CVE-2021-23980 / GHSA-vv2x-vrpj-qqpq
• bump python version to 3.8 for tox doc, vendorverify, and lint targets
• update bug report template tag
• update vendorverify script to detect and fail when extra files are vendored
• update release process docs to check vendorverify passes locally

Bug fixes

• remove extra vendored django present in the v3.3.0 whl #595
• duplicate h1 header doc fix (thanks Nguyễn Gia Phong / @McSinyx!)

Backwards incompatible changes

• clean escapes HTML comments even when strip_comments=False

Security fixes

• Fix bug 1621692 / GHSA-m6xf-fq7q-8743. See the advisory for details.

Features

None

Bug fixes

None

Security fixes

None

Features

None

Bug fixes

• fix clean and linkify raising ValueErrors for certain inputs. Thank you @Google-Autofuzz.

Security fixes

None

Features

• Migrate CI to Github Actions. Thank you @hugovk.

Bug fixes

• fix linkify raising an IndexError on certain inputs. Thank you @Google-Autofuzz.

Security fixes

None

Features

None

Bug fixes

• change linkifier to add rel="nofollow" as documented. Thank you @mitar.
• suppress html5lib sanitizer DeprecationWarnings (#557)

Security fixes

None

Features

None

Bug fixes

• html5lib dependency to version 1.1.0. Thank you Sam Sneddon.
• update tests_website terminology. Thank you Thomas Grainger.

Security fixes

None

Features

None

Bug fixes

• replace missing setuptools dependency with packaging. Thank you Benjamin Peterson.

Security fixes

• 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 were vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

  This issue was confirmed in Bleach versions v3.1.3, v3.1.2, v3.1.1, v3.1.0, v3.0.0, v2.1.4, and v2.1.3. Earlier versions used a similar regular expression and should be considered vulnerable too.

  Anyone using Bleach <=v3.1.3 is encouraged to upgrade.

  https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

Backwards incompatible changes

• Style attributes with dashes, or single or double quoted values are cleaned instead of passed through.

Features

None

Bug fixes

None

Security fixes

None

Backwards incompatible changes

• Drop support for Python 3.4. Thank you, @hugovk!

• Drop deprecated setup.py test support. Thank you, @jdufresne! (#507)

Features

• Add support for Python 3.8. Thank you, @jdufresne!

• Add support for PyPy 7. Thank you, @hugovk!

• Add pypy3 testing to tox and travis. Thank you, @jdufresne!

Bug fixes

• Add relative link to code of conduct. (#442)

• Fix typo: curren -> current in tests/test_clean.py Thank you, timgates42! (#504)

• Fix handling of non-ascii style attributes. Thank you, @sekineh! (#426)

• Simplify tox configuration. Thank you, @jdufresne!

• Make documentation reproducible. Thank you, @lamby!

• Fix typos in code comments. Thank you, @zborboa-g!

• Fix exception value testing. Thank you, @mastizada!

• Fix parser-tags NoneType exception. Thank you, @bope!

• Improve TLD support in linkify. Thank you, @pc-coholic!

Security fixes

• bleach.clean behavior parsing embedded MathML and SVG content with RCDATA tags did not match browser behavior and could result in a mutation XSS.

  Calls to bleach.clean with strip=False and math or svg tags and one or more of the RCDATA tags script, noscript, style, noframes, iframe, noembed, or xmp in the allowed tags whitelist were vulnerable to a mutation XSS.

  This security issue was confirmed in Bleach version v3.1.1. Earlier versions are likely affected too.

  Anyone using Bleach <=v3.1.1 is encouraged to upgrade.

  https://bugzilla.mozilla.org/show_bug.cgi?id=1621692

Backwards incompatible changes

None

Features

None

Bug fixes

None

Security fixes

• bleach.clean behavior parsing noscript tags did not match browser behavior.

  Calls to bleach.clean allowing noscript and one or more of the raw text tags (title, textarea, script, style, noembed, noframes, iframe, and xmp) were vulnerable to 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 <=v3.1.0 is highly encouraged to upgrade.

  https://bugzilla.mozilla.org/show_bug.cgi?id=1615315

Backwards incompatible changes

None

Features

None

Bug fixes

None

Security fixes

None

Backwards incompatible changes

None

Features

• Add recognized_tags argument to the linkify Linker class. This fixes 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 links across &. (#422)

• Fix InputStreamWithMemory when the BleachHTMLParser is parsing meta tags. (#431)

• Fix doctests. (#357)

Security fixes

None

Backwards incompatible changes

None

Features

None

Bug fixes

• Merge Characters tokens after sanitizing them. This fixes issues in the LinkifyFilter where it was only linkifying parts of urls. (#374)

Security fixes

None

Backwards incompatible changes

None

Features

• Support Python 3.7. It supported Python 3.7 just fine, but we added 3.7 to the list of Python environments we test so this is now officially supported. (#377)

Bug fixes

• Fix list object has no attribute lower in clean. (#398)
• Fix abbr getting escaped in linkify. (#400)

Security fixes

None

Backwards incompatible changes

• A bunch of functions were moved from one module to another.

  These were moved from bleach.sanitizer to bleach.html5lib_shim:

  • convert_entity
  • convert_entities
  • match_entity
  • next_possible_entity
  • BleachHTMLSerializer
  • BleachHTMLTokenizer
  • BleachHTMLParser

  These functions and classes weren't documented and aren't part of the public API, but people read code and might be using them so we're considering it an incompatible API change.

  If you're using them, you'll need to update your code.

Features

• Bleach no longer depends on html5lib. html5lib==1.0.1 is now vendored into Bleach. You can remove it from your requirements file if none of your other requirements require html5lib.

  This means Bleach will now work fine with other libraries that depend on html5lib regardless of what version of html5lib they require. (#386)

Bug fixes

• Fixed tags getting added when using clean or linkify. This was a long-standing regression from the Bleach 2.0 rewrite. (#280, #392)

• Fixed <isindex> getting replaced with a string. Now it gets escaped or stripped depending on whether it's in the allowed tags or not. (#279)

Security fixes

None

Backwards incompatible changes

• Dropped support for Python 3.3. (#328)

Features

None

Bug fixes

• Handle ambiguous ampersands in correctly. (#359)

Security fixes

• Attributes that have URI values weren't properly sanitized if the values contained character entities. Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.

  This security issue was introduced in Bleach 2.1. Anyone using Bleach 2.1 is highly encouraged to upgrade.

  https://bugzilla.mozilla.org/show_bug.cgi?id=1442745

Backwards incompatible changes

None

Features

None

Bug fixes

• Fixed some other edge cases for attribute URI value sanitizing and improved testing of this code.

Security fixes

None

Backwards incompatible changes

None

Features

None

Bug fixes

• Support html5lib-python 1.0.1. (#337)

• Add deprecation warning for supporting html5lib-python < 1.0.

• Switch to semver.

Security fixes

None

Backwards incompatible changes

None

Features

None

Bug fixes

• Fix setup.py opening files when LANG=. (#324)

Security fixes

• Convert control characters (backspace particularly) to "?" preventing malicious copy-and-paste situations. (#298)

  See <https://github.com/mozilla/bleach/issues/298>_ for more details.

  This affects all previous versions of Bleach. Check the comments on that issue for ways to alleviate the issue if you can't upgrade to Bleach 2.1.

Backwards incompatible changes

• Redid versioning. bleach.VERSION is no longer available. Use the string version at bleach.__version__ and parse it with pkg_resources.parse_version. (#307)

• clean, linkify: linkify and clean should only accept text types; thank you, Janusz! (#292)

• clean, linkify: accept only unicode or utf-8-encoded str (#176)

Features

Bug fixes

• bleach.clean() no longer unescapes entities including ones that are missing a ; at the end which can happen in urls and other places. (#143)

• linkify: fix http links inside of mailto links; thank you, sedrubal! (#300)

• clarify security policy in docs (#303)

• fix dependency specification for html5lib 1.0b8, 1.0b9, and 1.0b10; thank you, Zoltán! (#268)

• add Bleach vs. html5lib comparison to README; thank you, Stu Cox! (#278)

• fix KeyError exceptions on tags without href attr; thank you, Alex Defsen! (#273)

• add test website and scripts to test bleach.clean() output in browser; thank you, Greg Guthe!

Security fixes

• None

Changes

• Limit to html5lib >=0.999,<0.99999999 because of impending change to sanitizer api. #195

Changes

• linkify: Fix hang in linkify with parse_email=True. (#124)

• linkify: Fix crash in linkify when removing a link that is a first-child. (#136)

• Updated TLDs.

• linkify: Don't remove exterior brackets when linkifying. (#146)

Changes

• Consistent order of attributes in output.

• Python 3.4 support.

Changes

• linkify: Update linkify to use etree type Treewalker instead of simpletree.

• Updated html5lib to version >=0.999.

• Update all code to be compatible with Python 3 and 2 using six.

• Switch to Apache License.

• Pin html5lib to version 0.95 for now due to major API break.

• clean() no longer considers feed: an acceptable protocol due to inconsistencies in browser behavior.

• linkify() has changed considerably. Many keyword arguments have been replaced with a single callbacks list. Please see the documentation for more information.

• Bleach will no longer consider unacceptable protocols when linkifying.

• linkify() now takes a tokenizer argument that allows it to skip sanitization.

• delinkify() is gone.

• Removed exception handling from _render. clean() and linkify() may now throw.

• linkify() correctly ignores case for protocols and domain names.

• linkify() correctly handles markup within an <a> tag.

• Fix parsing bare URLs when parse_email=True.

• Fix hang in style attribute sanitizer. (#61)

• Allow / in style attribute values.

• Fix tokenizer for html5lib 0.9.5.

• linkify() now understands port numbers. (#38)

• Documented character encoding behavior. (#41)

• Add an optional target argument to linkify().

• Add delinkify() method. (#45)

• Support subdomain whitelist for delinkify(). (#47, #48)

• Switch to SemVer git tags.

• Make linkify() smarter about trailing punctuation. (#30)

• Pass exc_info to logger during rendering issues.

• Add wildcard key for attributes. (#19)

• Make linkify() use the HTMLSanitizer tokenizer. (#36)

• Fix URLs wrapped in parentheses. (#23)

• Make linkify() UTF-8 safe. (#33)

• linkify() works with 3rd level domains. (#24)

• clean() supports vendor prefixes in style values. (#31, #32)

• Fix linkify() email escaping.

• linkify() supports email addresses.

• clean() supports callables in attributes filter.

• linkify() doesn't drop trailing slashes. (#21)
• linkify() won't linkify 'libgl.so.1'. (#22)