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| purl | pkg:pypi/waitress@1.4.1 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-5g9e-fz5j-5fg6
Aliases: CVE-2020-5236 GHSA-73m2-3pwg-5fgc PYSEC-2020-155 |
Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like "Bad-header: xxxxxxxxxxxxxxx\x10" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible. |
Affected by 2 other vulnerabilities. |
|
VCID-gnaw-ht2x-9bas
Aliases: CVE-2022-24761 GHSA-4f7p-27jc-3c36 PYSEC-2022-169 |
Affected by 3 other vulnerabilities. |
|
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VCID-ujpr-gc5n-s3bc
Aliases: CVE-2024-49769 GHSA-3f84-rpwh-47g6 PYSEC-2024-211 |
Waitress is a Web Server Gateway Interface server for Python 2 and 3. When a remote client closes the connection before waitress has had the opportunity to call getpeername() waitress won't correctly clean up the connection leading to the main thread attempting to write to a socket that no longer exists, but not removing it from the list of sockets to attempt to process. This leads to a busy-loop calling the write function. A remote attacker could run waitress out of available sockets with very little resources required. Waitress 3.0.1 contains fixes that remove the race condition. |
Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| VCID-zd7n-85nm-93cm | In Waitress through version 1.4.0, if a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress leading to a potential for HTTP request smuggling. Specially crafted requests containing special whitespace characters in the Transfer-Encoding header would get parsed by Waitress as being a chunked request, but a front-end server would use the Content-Length instead as the Transfer-Encoding header is considered invalid due to containing invalid characters. If a front-end server does HTTP pipelining to a backend Waitress server this could lead to HTTP request splitting which may lead to potential cache poisoning or unexpected information disclosure. This issue is fixed in Waitress 1.4.1 through more strict HTTP field validation. |
CVE-2019-16789
GHSA-968f-66r5-5v74 PYSEC-2019-138 |
| Date | Actor | Action | Vulnerability | Source | VulnerableCode Version |
|---|---|---|---|---|---|
| 2026-06-02T04:22:27.561123+00:00 | Pypa Importer | Affected by | VCID-ujpr-gc5n-s3bc | https://github.com/pypa/advisory-database/blob/main/vulns/waitress/PYSEC-2024-211.yaml | 38.6.0 |
| 2026-06-02T04:17:09.585751+00:00 | Pypa Importer | Affected by | VCID-gnaw-ht2x-9bas | https://github.com/pypa/advisory-database/blob/main/vulns/waitress/PYSEC-2022-169.yaml | 38.6.0 |
| 2026-06-02T04:06:10.644636+00:00 | Pypa Importer | Affected by | VCID-5g9e-fz5j-5fg6 | https://github.com/pypa/advisory-database/blob/main/vulns/waitress/PYSEC-2020-155.yaml | 38.6.0 |
| 2026-06-02T04:06:02.304583+00:00 | Pypa Importer | Fixing | VCID-zd7n-85nm-93cm | https://github.com/pypa/advisory-database/blob/main/vulns/waitress/PYSEC-2019-138.yaml | 38.6.0 |