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Moderate severityNVD Advisory· Published Oct 25, 2024· Updated Jan 3, 2025

Werkzeug possible resource exhaustion when parsing file data in forms

CVE-2024-49767

Description

Werkzeug is a Web Server Gateway Interface web application library. Applications using werkzeug.formparser.MultiPartParser corresponding to a version of Werkzeug prior to 3.0.6 to parse multipart/form-data requests (e.g. all flask applications) are vulnerable to a relatively simple but effective resource exhaustion (denial of service) attack. A specifically crafted form submission request can cause the parser to allocate and block 3 to 8 times the upload size in main memory. There is no upper limit; a single upload at 1 Gbit/s can exhaust 32 GB of RAM in less than 60 seconds. Werkzeug version 3.0.6 fixes this issue.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
WerkzeugPyPI
>= 2.0.0rc1, < 3.0.63.0.6
QuartPyPI
< 0.20.00.20.0

Affected products

61

Patches

Vulnerability mechanics

References

9

News mentions

0

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