24.0.0

New Features

• ASGI Worker (Beta): Native asyncio-based ASGI support for running async Python frameworks like FastAPI, Starlette, and Quart without external dependencies

  • HTTP/1.1 with keepalive connections
  • WebSocket support
  • Lifespan protocol for startup/shutdown hooks
  • Optional uvloop for improved performance

• uWSGI Binary Protocol: Support for receiving requests from nginx via uwsgi_pass directive

• Documentation Migration: Migrated to MkDocs with Material theme

Security

• eventlet: Require eventlet >= 0.40.3 (CVE-2021-21419, CVE-2025-58068)
• gevent: Require gevent >= 24.10.1 (CVE-2023-41419, CVE-2024-3219)
• tornado: Require tornado >= 6.5.0 (CVE-2025-47287)

Install

pip install gunicorn==24.0.0

23.0.0

Gunicorn 23.0.0 has been released. This version improve HTTP 1.1. support and which improve safety

You're invited to upgrade asap your own installation.

23.0.0 - 2024-08-10

• minor docs fixes (:pr:3217, :pr:3089, :pr:3167)
• worker_class parameter accepts a class (:pr:3079)
• fix deadlock if request terminated during chunked parsing (:pr:2688)
• permit receiving Transfer-Encodings: compress, deflate, gzip (:pr:3261)
• permit Transfer-Encoding headers specifying multiple encodings. note: no parameters, still (:pr:3261)
• sdist generation now explicitly excludes sphinx build folder (:pr:3257)
• decode bytes-typed status (as can be passed by gevent) as utf-8 instead of raising TypeError (:pr:2336)
• raise correct Exception when encounting invalid chunked requests (:pr:3258)
• the SCRIPT_NAME and PATH_INFO headers, when received from allowed forwarders, are no longer restricted for containing an underscore (:pr:3192)
• include IPv6 loopback address [::1] in default for :ref:forwarded-allow-ips and :ref:proxy-allow-ips (:pr:3192)

** NOTE **

• The SCRIPT_NAME change mitigates a regression that appeared first in the 22.0.0 release
• Review your :ref:forwarded-allow-ips setting if you are still not seeing the SCRIPT_NAME transmitted
• Review your :ref:forwarder-headers setting if you are missing headers after upgrading from a version prior to 22.0.0

** Breaking changes **

• refuse requests where the uri field is empty (:pr:3255)
• refuse requests with invalid CR/LR/NUL in heade field values (:pr:3253)
• remove temporary --tolerate-dangerous-framing switch from 22.0 (:pr:3260)
• If any of the breaking changes affect you, be aware that now refused requests can post a security problem, especially so in setups involving request pipe-lining and/or proxies.

Fix CVE-2024-1135

Gunicorn 22.0 has been released

Gunicorn 22.0.0 has been released. This version fix the numerous security vulnerabilities. You're invited to upgrade asap your own installation.

Changes:

22.0.0 - 2024-04-17
===================

- use `utime` to notify workers liveness
- migrate setup to pyproject.toml
- fix numerous security vulnerabilities in HTTP parser (closing some request smuggling vectors)
- parsing additional requests is no longer attempted past unsupported request framing
- on HTTP versions < 1.1 support for chunked transfer is refused (only used in exploits)
- requests conflicting configured or passed SCRIPT_NAME now produce a verbose error
- Trailer fields are no longer inspected for headers indicating secure scheme
- support Python 3.12

** Breaking changes **

- minimum version is Python 3.7
- the limitations on valid characters in the HTTP method have been bounded to Internet Standards
- requests specifying unsupported transfer coding (order) are refused by default (rare)
- HTTP methods are no longer casefolded by default (IANA method registry contains none affected)
- HTTP methods containing the number sign (#) are no longer accepted by default (rare)
- HTTP versions < 1.0 or >= 2.0 are no longer accepted by default (rare, only HTTP/1.1 is supported)
- HTTP versions consisting of multiple digits or containing a prefix/suffix are no longer accepted
- HTTP header field names Gunicorn cannot safely map to variables are silently dropped, as in other software
- HTTP headers with empty field name are refused by default (no legitimate use cases, used in exploits)
- requests with both Transfer-Encoding and Content-Length are refused by default (such a message might indicate an attempt to perform request smuggling)
- empty transfer codings are no longer permitted (reportedly seen with really old & broken proxies)


** SECURITY **

- fix CVE-2024-1135

1. Documentation is available there: https://docs.gunicorn.org/en/stable/news.html
2. Packages: https://pypi.org/project/gunicorn/

Gunicorn 21.2.0 has been released

Gunicorn 21.2.0 has been released. This version fix the issue introduced in the threaded worker.

Changes:

21.2.0 - 2023-07-19
===================
fix thread worker: revert change considering connection as idle .

*** NOTE ***

This is fixing the bad file description error.

1. Documentation is available there: https://docs.gunicorn.org/en/stable/news.html
2. Packages: https://pypi.org/project/gunicorn/

Gunicorn 21.1.0 has been released

gunicorn 21.1.0 has been released. This version fix the issue introduced in the threaded worker.

21.1.0 - 2023-07-18

• fix thread worker: fix socket removal from the queuet checkout 21.x

Gunicorn 21 has been released

Gunicorn 21 is out with miscellaneous changes. Enjoy!

We made this release major to start our new release cycle. More info will be provided on our discussion forum.

21.0.1 - 2023-07-17

fix documentation build

21.0.0 - 2023-07-17

support python 3.11
fix gevent and eventlet workers
fix threads support (gththread): improve performance and unblock requests
SSL: noaw use SSLContext object
HTTP parser: miscellaneous fixes
remove unecessary setuid calls
fix testing
improve logging
miscellaneous fixes to core engine

Full Changelog: 21.0.0...21.0.1

20.1.0

• document WEB_CONCURRENCY is set by, at least, Heroku
• capture peername from accept: Avoid calls to getpeername by capturing the peer name returned by
  accept
• log a warning when a worker was terminated due to a signal
• fix tornado usage with latest versions of Django
• add support for python -m gunicorn
• fix systemd socket activation example
• allows to set wsgi application in configg file using wsgi_app
• document --timeout = 0
• always close a connection when the number of requests exceeds the max requests
• Disable keepalive during graceful shutdown
• kill tasks in the gthread workers during upgrade
• fix latency in gevent worker when accepting new requests
• fix file watcher: handle errors when new worker reboot and ensure the list of files is kept
• document the default name and path of the configuration file
• document how variable impact configuration
• document the $PORT environment variable
• added milliseconds option to request_time in access_log
• added PIP requirements to be used for example
• remove version from the Server header
• fix sendfile: use socket.sendfile instead of os.sendfile
• reloader: use absolute path to prevent empty to prevent0 InotifyError when a file
  is added to the working directory
• Add --print-config option to print the resolved settings at startup.
• remove the --log-dict-config CLI flag because it never had a working format
  (the logconfig_dict setting in configuration files continues to work)

** Breaking changes **

• minimum version is Python 3.5
• remove version from the Server header

** Documentation **

** Others **

• miscellaneous changes in the code base to be a better citizen with Python 3
• remove dead code
• fix documentation generation

20.0.4

• fix binding a socket using the file descriptor
• remove support for the bdist_rpm build

20.0.3

• fixed load of a config file without a Python extension
• fixed socketfromfd.fromfd when defaults are not set

note: we now warn when we load a config file without Python Extension

20.0.2

20.0.2

• fix changelog

20.0.1

• fixed the way the config module is loaded. __file__ is now available
• fixed wsgi.input_terminated. It is always true.
• use the highest protocol version of openssl by default
• only support Python >= 3.5
• added __repr__ method to Config instance
• fixed support of AIX platform and musl libc in socketfromfd.fromfd function
• fixed support of applications loaded from a factory function
• fixed chunked encoding support to prevent any request smuggling <https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn>_
• Capture os.sendfile before patching in gevent and eventlet workers.
  fix RecursionError.
• removed locking in reloader when adding new files
• load the WSGI application before the loader to pick up all files

note this release add official support for applications loaded from a factory function
as documented in Flask and other places.