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Bleach changes
==============
Version 6.0.0 (January 23rd, 2023)
----------------------------------
**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.
Version 5.0.1 (June 27th, 2022)
-------------------------------
**Security fixes**
None
**Bug fixes**
* 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)
Version 5.0.0 (April 7th, 2022)
-------------------------------
**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)
**Security fixes**
None
**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)
Version 4.1.0 (August 25th, 2021)
---------------------------------
**Features**
* Python 3.9 support
**Security fixes**
None
**Bug fixes**
* Update sanitizer clean to use vendored 3.6.14 stdlib urllib.parse to
fix test failures on Python 3.9. (#536)
Version 4.0.0 (August 3rd, 2021)
--------------------------------
**Backwards incompatible changes**
* Drop support for unsupported Python versions <3.6. (#520)
**Security fixes**
None
**Features**
* fix attribute name in the linkify docs (thanks @CheesyFeet!)
Version 3.3.1 (July 14th, 2021)
-------------------------------
**Security fixes**
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!)
Version 3.3.0 (February 1st, 2021)
----------------------------------
**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
Version 3.2.3 (January 26th, 2021)
----------------------------------
**Security fixes**
None
**Features**
None
**Bug fixes**
* fix clean and linkify raising ValueErrors for certain inputs. Thank you @Google-Autofuzz.
Version 3.2.2 (January 20th, 2021)
----------------------------------
**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.
Version 3.2.1 (September 18th, 2020)
------------------------------------
**Security fixes**
None
**Features**
None
**Bug fixes**
* change linkifier to add rel="nofollow" as documented. Thank you @mitar.
* suppress html5lib sanitizer DeprecationWarnings (#557)
Version 3.2.0 (September 16th, 2020)
------------------------------------
**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.
Version 3.1.5 (April 29th, 2020)
--------------------------------
**Security fixes**
None
**Features**
None
**Bug fixes**
* replace missing ``setuptools`` dependency with ``packaging``. Thank you Benjamin Peterson.
Version 3.1.4 (March 24th, 2020)
--------------------------------
**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
Version 3.1.3 (March 17th, 2020)
--------------------------------
**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!
Version 3.1.2 (March 11th, 2020)
--------------------------------
**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
Version 3.1.1 (February 13th, 2020)
-----------------------------------
**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
Version 3.1.0 (January 9th, 2019)
---------------------------------
**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)
Version 3.0.2 (October 11th, 2018)
----------------------------------
**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)
Version 3.0.1 (October 9th, 2018)
---------------------------------
**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)
Version 3.0.0 (October 3rd, 2018)
---------------------------------
**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)
Version 2.1.4 (August 16th, 2018)
---------------------------------
**Security fixes**
None
**Backwards incompatible changes**
* Dropped support for Python 3.3. (#328)
**Features**
None
**Bug fixes**
* Handle ambiguous ampersands in correctly. (#359)
Version 2.1.3 (March 5th, 2018)
-------------------------------
**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.
Version 2.1.2 (December 7th, 2017)
----------------------------------
**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.
Version 2.1.1 (October 2nd, 2017)
---------------------------------
**Security fixes**
None
**Backwards incompatible changes**
None
**Features**
None
**Bug fixes**
* Fix ``setup.py`` opening files when ``LANG=``. (#324)
Version 2.1 (September 28th, 2017)
----------------------------------
**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!
Version 2.0 (March 8th, 2017)
-----------------------------
**Security fixes**
* None
**Backwards incompatible changes**
* Removed support for Python 2.6. (#206)
* Removed support for Python 3.2. (#224)
* Bleach no longer supports html5lib < 0.99999999 (8 9s).
This version is a rewrite to use the new sanitizing API since the old
one was dropped in html5lib 0.99999999 (8 9s).
If you're using 0.9999999 (7 9s) upgrade to 0.99999999 (8 9s) or higher.
If you're using 1.0b8 (equivalent to 0.9999999 (7 9s)), upgrade to 1.0b9
(equivalent to 0.99999999 (8 9s)) or higher.
* ``bleach.clean`` and friends were rewritten
``clean`` was reimplemented as an html5lib filter and happens at a different
step in the HTML parsing -> traversing -> serializing process. Because of
that, there are some differences in clean's output as compared with previous
versions.
Amongst other things, this version will add end tags even if the tag in
question is to be escaped.
* ``bleach.clean`` and friends attribute callables now take three arguments:
tag, attribute name and attribute value. Previously they only took attribute
name and attribute value.
All attribute callables will need to be updated.
* ``bleach.linkify`` was rewritten
``linkify`` was reimplemented as an html5lib Filter. As such, it no longer
accepts a ``tokenizer`` argument.
The callback functions for adjusting link attributes now takes a namespaced
attribute.
Previously you'd do something like this::
def check_protocol(attrs, is_new):
if not attrs.get('href', '').startswith('http:', 'https:')):
return None
return attrs
Now it's more like this::
def check_protocol(attrs, is_new):
if not attrs.get((None, u'href'), u'').startswith(('http:', 'https:')):
# ^^^^^^^^^^^^^^^
return None
return attrs
Further, you need to make sure you're always using unicode values. If you
don't then html5lib will raise an assertion error that the value is not
unicode.
All linkify filters will need to be updated.
* ``bleach.linkify`` and friends had a ``skip_pre`` argument--that's been
replaced with a more general ``skip_tags`` argument.
Before, you might do::
bleach.linkify(some_text, skip_pre=True)
The equivalent with Bleach 2.0 is::
bleach.linkify(some_text, skip_tags=['pre'])
You can skip other tags, too, like ``style`` or ``script`` or other places
where you don't want linkification happening.
All uses of linkify that use ``skip_pre`` will need to be updated.
**Changes**
* Supports Python 3.6.
* Supports html5lib >= 0.99999999 (8 9s).
* There's a ``bleach.sanitizer.Cleaner`` class that you can instantiate with your
favorite clean settings for easy reuse.
* There's a ``bleach.linkifier.Linker`` class that you can instantiate with your
favorite linkify settings for easy reuse.
* There's a ``bleach.linkifier.LinkifyFilter`` which is an htm5lib filter that
you can pass as a filter to ``bleach.sanitizer.Cleaner`` allowing you to clean
and linkify in one pass.
* ``bleach.clean`` and friends can now take a callable as an attributes arg value.
* Tons of bug fixes.
* Cleaned up tests.
* Documentation fixes.
Version 1.5 (November 4th, 2016)
--------------------------------
**Security fixes**
* None
**Backwards incompatible changes**
* clean: The list of ``ALLOWED_PROTOCOLS`` now defaults to http, https and
mailto.
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. (#149)
**Changes**
* clean: Added ``protocols`` to arguments list to let you override the list of
allowed 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,<0.99999999`` because 0.9999
and 0.99999 are busted.
* Add support for ``python setup.py test``. (#97)
Version 1.4.3 (May 23rd, 2016)
------------------------------
**Security fixes**
* None
**Changes**
* Limit to html5lib ``>=0.999,<0.99999999`` because of impending change to
sanitizer api. #195
Version 1.4.2 (September 11, 2015)
----------------------------------
**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)
Version 1.4.1 (December 15, 2014)
---------------------------------
**Changes**
* Consistent order of attributes in output.
* Python 3.4 support.
Version 1.4 (January 12, 2014)
------------------------------
**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.
Version 1.3
-----------
* Used by Python 3-only fork.
Version 1.2.2 (May 18, 2013)
----------------------------
* Pin html5lib to version 0.95 for now due to major API break.
Version 1.2.1 (February 19, 2013)
---------------------------------
* ``clean()`` no longer considers ``feed:`` an acceptable protocol due to
inconsistencies in browser behavior.
Version 1.2 (January 28, 2013)
------------------------------
* ``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.
Version 1.1.5
-------------
Version 1.1.4
-------------
Version 1.1.3 (July 10, 2012)
-----------------------------
* Fix parsing bare URLs when parse_email=True.
Version 1.1.2 (June 1, 2012)