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CVE-2024-49768— Waitress has request processing race condition in HTTP pipelining with invalid first request

Quick assessment

Affected
Pylons waitress
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Waitress是Pylons项目的一个生产质量的纯 Python WSGI 服务器。 Waitress 3.0.1版本之前存在安全漏洞，该漏洞源于包含一个竞争条件问题。

CVSS 9.1 · Critical EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-49768

Vulnerability Information
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Vulnerability Title
Waitress has request processing race condition in HTTP pipelining with invalid first request
Source: CVE Program / CVE List V5
Vulnerability Description
Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is disabled (default) we won't read any more requests, and when the first request fails due to a parsing error, we simply close the connection. However when request lookahead is enabled, it is possible to process and receive the first request, start sending the error message back to the client while we read the next request and queue it. This will allow the secondary request to be serviced by the worker thread while the connection should be closed. Waitress 3.0.1 fixes the race condition. As a workaround, disable channel_request_lookahead, this is set to 0 by default disabling this feature.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Waitress 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Waitress是Pylons项目的一个生产质量的纯 Python WSGI 服务器。 Waitress 3.0.1版本之前存在安全漏洞，该漏洞源于包含一个竞争条件问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Pylons waitress >= 2.0.0, < 3.0.1 -

II. Public POCs for CVE-2024-49768

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Qwen3.6-35B-A3B · 7669 chars
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III. Intelligence Information for CVE-2024-49768

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Patches & Fixes for CVE-2024-49768 (1)

Vendor Advisories for CVE-2024-49768 (1)

IV. Related Vulnerabilities

Same product: waitress
Same vendor: Pylons
Same weakness: CWE-367

V. Comments for CVE-2024-49768

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