VulnerableCode Package Details - pkg:pypi/waitress@1.4.2

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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.	1.4.3 Affected by 2 other vulnerabilities. This version is affected by these other vulnerabilities: {{ fixed_by_vuln.vulnerability_id }} {{ fixed_by_vuln.vulnerability_id }}
VCID-gnaw-ht2x-9bas Aliases: CVE-2022-24761 GHSA-4f7p-27jc-3c36 PYSEC-2022-169		2.1.1 Affected by 3 other vulnerabilities. This version is affected by these other vulnerabilities: {{ fixed_by_vuln.vulnerability_id }} {{ fixed_by_vuln.vulnerability_id }} {{ fixed_by_vuln.vulnerability_id }}
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.	3.0.1 Affected by 0 other vulnerabilities.

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.

1.4.3
Affected by 2 other vulnerabilities.

VCID-gnaw-ht2x-9bas
Aliases:
CVE-2022-24761
GHSA-4f7p-27jc-3c36
PYSEC-2022-169

2.1.1
Affected by 3 other vulnerabilities.

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.

3.0.1
Affected by 0 other vulnerabilities.

Vulnerability	Summary	Aliases
This package is not known to fix vulnerabilities.

Vulnerability

Summary

Aliases

This package is not known to fix vulnerabilities.

Date	Actor	Action	Vulnerability	Source	VulnerableCode Version
2026-06-02T04:22:27.564998+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
2026-06-02T04:17:09.589779+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
2026-06-02T04:06:10.649095+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