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Vulnerability record · CVE-2023-46136 · published 25 October 2023

CVE-2023-46136: Palletsprojects werkzeug uncontrolled resource consumption vulnerability

PPalletsprojects · Werkzeug

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.

7.5 CVSS 3.1 High EPSS 1.1% · top 36.5% CWE-400 · Uncontrolled resource consumptionCWE-407 · CWE-407
7.5CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2 Patch
https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw Vendor Advisory
https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2 Patch
https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw Vendor Advisory
https://security.netapp.com/advisory/ntap-20231124-0008/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-46136), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.