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Moderate severityNVD Advisory· Published Dec 20, 2019· Updated Aug 5, 2024

HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress

CVE-2019-16786

Description

Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header instead. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
waitressPyPI
< 1.4.01.4.0

Affected products

309

Patches

Vulnerability mechanics

References

13

News mentions

0

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