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Vulnerability record · CVE-2022-29361 · published 25 May 2022

CVE-2022-29361: Palletsprojects werkzeug http request smuggling vulnerability

PPalletsprojects · Werkzeug

Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included inside the body. NOTE: the vendor's position is that this behavior can only occur in unsupported configurations involving development mode and an HTTP server from outside the Werkzeug project

9.8 CVSS 3.1 Critical EPSS 8.1% · top 5.4% CWE-444 · HTTP request smuggling
9.8CVSS 3.1 base score, v2 7.5
8.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included inside the body. NOTE: the vendor's position is that this behavior can only occur in unsupported configurations involving development mode and an HTTP server from outside the Werkzeug project

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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/9a3a981d70d2e9ec3344b5192f86fcaf3210cd85 PatchThird Party Advisory
https://github.com/pallets/werkzeug/issues/2420 Issue TrackingThird Party Advisory
https://github.com/pallets/werkzeug/commit/9a3a981d70d2e9ec3344b5192f86fcaf3210cd85 PatchThird Party Advisory
https://github.com/pallets/werkzeug/issues/2420 Issue TrackingThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-29361), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.