What’s Vulnerable › Vulnerabilities

CVE-2024-49767: Werkzeug possible resource exhaustion when parsing file data in forms

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-25 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• pallets Quart: before 0.19.7 — fixed in 0.19.7
• pallets werkzeug: before 3.0.6 — fixed in 3.0.6

How to fix

Upgrade to a fixed version: pallets Quart 0.19.7; pallets werkzeug 3.0.6. Check the vendor advisory for mitigations.

References

• 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/releases/tag/3.0.6
• https://github.com/pallets/werkzeug/security/advisories/GHSA-q34m-jh98-gwm2
• https://security.netapp.com/advisory/ntap-20250103-0007/

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