{"id":"CVE-2022-24761","aliases":["AZL-43984","AZL-45060","DEBIAN-CVE-2022-24761","DLA-3000-1","DSA-5138-1","EUVD-2022-0358","GHSA-4f7p-27jc-3c36","MGASA-2022-0182","OESA-2022-1643","PYSEC-2022-169","RHSA-2022:1253","RHSA-2022:1254","RHSA-2022:1264","SUSE-SU-2022:3583-1","SUSE-SU-2022:3635-1","SUSE-SU-2022:3731-1","UBUNTU-CVE-2022-24761","USN-5364-1","openSUSE-SU-2024:11942-1","openSUSE-SU-2025:15108-1"],"status":"published","title":"HTTP Request Smuggling in waitress","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0178,"percentile":0.78542,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2022-03-17T12:40:10Z","modified":"2026-11-03T08:00:42Z","fixes":[{"ecosystem":"PyPI","package":"waitress","fixed_in":["2.1.1"],"sources":["ghsa","osv"]},{"ecosystem":"Azure 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Party Advisory","advisory","web","article","report"]},{"url":"https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0","tags":["x_refsource_MISC","x_transferred","Patch","Release Notes","Third Party Advisory","fix","web","report"]},{"url":"https://github.com/Pylons/waitress/releases/tag/v2.1.1","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","web","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","article","web"]},{"url":"https://www.debian.org/security/2022/dsa-5138","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-24761","tags":["web","advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/waitress/PYSEC-2022-169.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-4f7p-27jc-3c36"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/24xxx/CVE-2022-24761.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2022-24761","tags":["advisory"]},{"url":"https://github.com/Pylons/waitress","tags":["package"]},{"url":"https://advisories.mageia.org/MGASA-2022-0182.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=30248","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5364-1","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1643","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1253","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2065086","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_1253.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-24761","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-24761","tags":["advisory","report"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1254","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_1254.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1264","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_1264.json","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20223583-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1197255","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2022-24761","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20223635-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20223731-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2022-24761","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/6Q3O22UMHKQ3MPP3ZUQNRRPVZ4GVNVON/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2022-31015","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2022-24761","title":"HTTP Request Smuggling in waitress","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T12:40:10Z","modified":"2025-04-23T18:46:46.567Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:34:34.940806Z"}],"euvd":[{"id":"EUVD-2022-0358","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T12:40:10Z","modified":"2025-04-23T18:46:46Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T20:52:07.950001Z"}],"ghsa":[{"id":"GHSA-4f7p-27jc-3c36","title":"HTTP Request Smuggling in waitress","description":"### Impact\n\nWhen using Waitress behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends.\n\nThis would allow requests to be smuggled via the front-end proxy to waitress and later behavior.\n\nThere are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory:\n\n- The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits.\n- Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters\n\n### Patches\n\nThis has been fixed in Waitress 2.1.1\n\n### Workarounds\n\nWhen deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.\n\n### References\n\n- https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [the Github issue tracker](https://github.com/Pylons/waitress/issues) (if not security related/sensitive)\n* Email us at [pylons-project-security@googlegroups.com](mailto:pylons-project-security@googlegroups.com) (If security related or sensitive)\n","status":"published","published":"2022-03-18T19:00:59Z","modified":"2024-11-19T16:04:19Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:38:20.833758Z"}],"nvd":[{"id":"CVE-2022-24761","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:07.647Z","modified":"2026-06-17T04:32:27.557Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:07:14.24948Z"}],"osv":[{"id":"AZL-43984","title":"CVE-2022-24761 affecting package python-waitress 1.4.4-7","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:07Z","modified":"2026-04-21T04:31:14.565727Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:05.284713Z"},{"id":"AZL-45060","title":"CVE-2022-24761 affecting package python-waitress for versions less than 3.0.1-1","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:07Z","modified":"2026-04-21T04:49:11.996983Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:05.694722Z"},{"id":"CVE-2022-24761","title":"HTTP Request Smuggling in waitress","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T12:40:10Z","modified":"2026-10-28T02:30:53.986657585Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:44:24.428403Z"},{"id":"DEBIAN-CVE-2022-24761","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:07.647Z","modified":"2026-11-03T08:00:42.298312177Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T08:25:15.646766Z"},{"id":"GHSA-4f7p-27jc-3c36","title":"HTTP Request Smuggling in waitress","description":"### Impact\n\nWhen using Waitress behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends.\n\nThis would allow requests to be smuggled via the front-end proxy to waitress and later behavior.\n\nThere are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory:\n\n- The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits.\n- Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters\n\n### Patches\n\nThis has been fixed in Waitress 2.1.1\n\n### Workarounds\n\nWhen deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.\n\n### References\n\n- https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [the Github issue tracker](https://github.com/Pylons/waitress/issues) (if not security related/sensitive)\n* Email us at [pylons-project-security@googlegroups.com](mailto:pylons-project-security@googlegroups.com) (If security related or sensitive)\n","status":"published","published":"2022-03-18T19:00:59Z","modified":"2024-11-19T16:22:31.940218Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:46:36.782754Z"},{"id":"OESA-2022-1643","title":"python-waitress security update","description":"Waitress is meant to be a production-quality pure-Python WSGI server with very acceptable performance. It has no dependencies except ones which live in the Python standard library. It runs on CPython on Unix and Windows under Python 2.7+ and Python 3.5+. It is also known to run on PyPy 1.6.0+ on UNIX. It supports HTTP/1.0 and HTTP/1.1.\n\r\nSecurity Fix(es):\r\n\r\nWaitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.(CVE-2022-24761)","status":"published","published":"2022-05-11T11:04:55Z","modified":"2026-08-18T01:16:27.721003397Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"RHSA-2022:1253","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (python-waitress) security update","status":"published","published":"2024-09-13T23:15:35Z","modified":"2026-07-03T10:01:51Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:1254","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 16.1 (python-waitress) security update","status":"published","published":"2024-09-13T23:15:44Z","modified":"2026-07-03T10:01:51Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2022:1264","title":"Red Hat Security Advisory: Red Hat OpenStack Platform 13.0 (python-waitress) security update","status":"published","published":"2024-09-13T23:16:01Z","modified":"2026-07-03T10:01:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:09.077222Z"},{"id":"UBUNTU-CVE-2022-24761","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:00Z","modified":"2026-02-05T03:39:46.956163Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:53:53.13624Z"},{"id":"DLA-3000-1","title":"waitress - security update","status":"published","published":"2022-05-12T00:00:00Z","modified":"2026-03-09T01:22:38.866836Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DSA-5138-1","title":"waitress - security update","status":"published","published":"2022-05-17T00:00:00Z","modified":"2026-03-09T02:10:05.748718Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2022-0182","title":"Updated python-waitress packages fix security vulnerability","description":"When using Waitress versions 2.1.0 and prior behind a proxy that does not\nproperly validate the incoming HTTP request matches the RFC7230 standard,\nWaitress and the frontend proxy may disagree on where one request starts\nand where it ends. This would allow requests to be smuggled via the\nfront-end proxy to waitress and later behavior. There are two classes of\nvulnerability that may lead to request smuggling that are addressed by\nthis advisory: The use of Python’s `int()` to parse strings into integers,\nleading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`,\nwhere as the standard specifies that the string should contain only digits\nor hex digits; and Waitress does not support chunk extensions, however it\nwas discarding them without validating that they did not contain illegal\ncharacters. This vulnerability has been patched in Waitress 2.1.1\n","status":"published","published":"2022-05-15T10:06:40Z","modified":"2026-04-16T04:44:05.666260241Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"openSUSE-SU-2024:11942-1","title":"python310-waitress-2.1.1-1.1 on GA media","description":"These are all security issues fixed in the python310-waitress-2.1.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:09:53.480702Z","updated_at":"2026-11-02T16:58:35.485255Z"},{"id":"openSUSE-SU-2025:15108-1","title":"python311-waitress-3.0.2-1.4 on GA media","description":"These are all security issues fixed in the python311-waitress-3.0.2-1.4 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-05-17T00:00:00Z","modified":"2025-05-22T10:59:08.455805Z","updated_at":"2026-11-02T16:58:37.399567Z"},{"id":"PYSEC-2022-169","description":"Waitress is a Web Server Gateway Interface server for Python 2 and 3. When using Waitress versions 2.1.0 and prior behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends. This would allow requests to be smuggled via the front-end proxy to waitress and later behavior. There are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory: The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits; and Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters. This vulnerability has been patched in Waitress 2.1.1. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.","status":"published","published":"2022-03-17T13:15:00Z","modified":"2023-11-08T04:08:35.551138Z","updated_at":"2026-11-02T15:52:53.449407Z"},{"id":"SUSE-SU-2022:3583-1","title":"Security update for python-waitress","description":"This update for python-waitress fixes the following issues:\n\n- CVE-2022-24761: Fixed a bug to avoid inconsistent interpretation of HTTP requests leading to request smuggling. (bsc#1197256)   \n","status":"published","published":"2022-10-14T07:11:57Z","modified":"2026-02-04T03:50:53.195527Z","updated_at":"2026-11-02T15:53:51.440565Z"},{"id":"SUSE-SU-2022:3635-1","title":"Security update for python-waitress","description":"This update for python-waitress fixes the following issues:\n\n- CVE-2022-24761: Fixed a bug to avoid inconsistent interpretation of HTTP requests leading to request smuggling. (bsc#1197255)\n","status":"published","published":"2022-10-18T15:18:53Z","modified":"2026-02-04T03:50:21.359312Z","updated_at":"2026-11-02T15:53:51.440565Z"},{"id":"SUSE-SU-2022:3731-1","title":"Security update for python-waitress","description":"This update for python-waitress fixes the following issues:\n\n- CVE-2022-24761: Fixed a bug to avoid inconsistent interpretation of HTTP requests leading to request smuggling. (bsc#1197255)\n","status":"published","published":"2022-10-25T15:11:03Z","modified":"2026-02-04T03:10:56.073845Z","updated_at":"2026-11-02T15:53:51.440565Z"},{"id":"USN-5364-1","title":"waitress vulnerability","description":"It was discovered that Waitress incorrectly handled certain requests.\nAn attacker could possibly use this issue to expose sensitive information.\n","status":"published","published":"2022-04-05T09:28:10Z","modified":"2026-02-10T04:42:33Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}