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Fencer Vulns
critical 9.8

CVE-2022-29361 json

Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted H…

published 2022-05-24 4 y ago modified 2026-06-17 4 mo ago also PYSEC-2022-203 , EUVD-2022-0363

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.1%
EPSS 8.1% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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

Patch / fix

  • pypi werkzeug 2.1.1
  • pgadmin4 openSUSE Tumbleweed 7.4-1.1

opensuse advisories openSUSE-SU-2024:13098-1

  • py3-werkzeug Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 2.2.2-r0

alpine advisories ALPINE-CVE-2022-29361

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-29361 updated

python-Werkzeug: HTTP Request Smuggling

  • Red Hat Ceph Storage 5 python-werkzeug, python3-werkzeug Red Hat Ceph Storage 6 python-werkzeug Red Hat Enterprise Linux 7 python-werkzeug Red Hat Enterprise Linux 8 python3-werkzeug Red Hat OpenShift Container Platform 4 python-werkzeug, python3-werkzeug Red Hat OpenStack Platform 16.1 python-werkzeug, python3-werkzeug
    +4 more products
    Red Hat OpenStack Platform 16.2 python-werkzeug, python3-werkzeug Red Hat OpenStack Platform 17.1 python-werkzeug, python3-werkzeug Red Hat OpenStack Platform 18.0 python-werkzeug Red Hat Storage 3 python-werkzeug
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.07% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected packages

ecosystem package affected fixed in
pypi werkzeug
<2.1.1
2.1.1

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.