🛡️ CVE-2019-16792 — waitress

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-444 OSV

8.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Duplicate Advisory: Inconsistent Interpretation of HTTP Requests in Waitress

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-4ppp-gpcr-7qf6. This link is maintained to preserve external references.

Original Description

Waitress through version 1.3.1 allows request smuggling by sending the Content-Length header twice. Waitress would header fold a double Content-Length header and due to being unable to cast the now comma separated value to an integer would set the Content-Length to 0 internally. If two Content-Length headers are sent in a single request, Waitress would treat the request as having no body, thereby treating the body of the request as a new request in HTTP pipelining. This issue is fixed in Waitress 1.4.0.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability none.

Weakness class

CVE-2019-16792 is classified as CWE-444: HTTP Request Smuggling. A proxy and a server disagree on where one request ends, letting an attacker slip a second request past the front end.

Affected software

CVE-2019-16792 is recorded against 1 package.

waitress (fixed in 1.4.0)

Timeline and source

Published on 24 May 2022 and last revised on 25 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
docs.pylonsproject.org (Web)
github.com (Package)
lists.debian.org (Web)
www.oracle.com (Web)

Details

Severity HIGH

CVSS Score 8.0

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE CWE-444

Public Exploit ✅ No

Source OSV

Published 2022-05-24

Updated 2026-08-12

Modified 2026-02-25

Fix URL N/A

Affected Packages

Software	From version	Fixed in
waitress	—	1.4.0

References

WEB https://github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-16792

WEB https://github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65

WEB https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes

PACKAGE https://github.com/Pylons/waitress

WEB https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html

WEB https://www.oracle.com/security-alerts/cpuapr2022.html

🔗 NVD 🔗 Mitre

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