What’s Vulnerable › Vulnerabilities
CVE-2019-16792: HTTP Request Smuggling: Content-Length Sent Twice in Waitress
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-01-22 · updated 2026-06-17
- Weakness: CWE-444
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.
Affected products
- Pylons Waitress: through 1.3.1
- Debian Linux: 9.0
- Oracle Communications Cloud Native Core Network Function Cloud Native Environment: 1.10.0
References
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes
- https://github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65
- https://github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6
- https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes
- https://github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65
- https://github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6
- https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
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