Werkzeug possible resource exhaustion when parsing file data in forms
Applications using Werkzeug to parse multipart/form-data requests are vulnerable to resource exhaustion. A specially crafted form body can bypass the Request.max_form_memory_size setting.
The Request.max_content_length setting, as well as resource limits provided by deployment software and platforms, are also available to limit the resources used during a request. This vulnerability does not affect those settings. All three types of limits should be considered and set appropriately when deploying an application.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | quart | < 0.20.0 | 0.20.0 |
| Python (PyPI) | werkzeug | >= 2.0.0rc1, < 3.0.6 | 3.0.6 |
References
- https://github.com/pallets/werkzeug/security/advisories/GHSA-q34m-jh98-gwm2
- https://nvd.nist.gov/vuln/detail/CVE-2024-49767
- https://github.com/pallets/quart/commit/5e78c4169b8eb66b91ead3e62d44721b9e1644ee
- https://github.com/pallets/quart/commit/abb04a512496206de279225340ed022852fbf51f
- https://github.com/pallets/werkzeug/commit/50cfeebcb0727e18cc52ffbeb125f4a66551179b
- https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5
- https://github.com/pallets/werkzeug
- https://github.com/pallets/werkzeug/releases/tag/3.0.6
- https://security.netapp.com/advisory/ntap-20250103-0007
- https://pypi.org/project/quart
- https://github.com/advisories/GHSA-q34m-jh98-gwm2
- https://pypi.org/project/werkzeug
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- Python (PyPI)
- Package
quart, werkzeug- Disclosed
- 25.10.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1860 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-3417 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-q34m-jh98-gwm2 - CC BY 4.0
Vulnerability history: werkzeug
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 15
- First → latest
- 10.2017 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 9
- Low 1
- Unrated 1
Disclosures per year
- 2017: 1
- 2018: 0
- 2019: 1
- 2020: 1
- 2021: 0
- 2022: 2
- 2023: 3
- 2024: 3
- 2025: 1
- 2026: 3
-
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