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High severity8.0NVD Advisory· Published Oct 25, 2023· Updated Jun 17, 2026

CVE-2023-46136

CVE-2023-46136

Description

Werkzeug is a comprehensive WSGI web application library. In versions on the 3.x branch prior to 3.0.1 and on the 2.x branch prior to 2.3.8, if an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1 and 2.3.8.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
WerkzeugPyPI
>= 3.0.0, < 3.0.13.0.1
WerkzeugPyPI
>= 2.0.0rc1, < 2.3.82.3.8

Affected products

29

Patches

Vulnerability mechanics

References

10

News mentions

0

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