CVE-2023-25577
Description
Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. 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. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Version 2.2.3 contains a patch for this issue.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 2.2.2-3 |
| debian | bullseye | fixed | 1.0.1+dfsg1-2+deb11u1 |
| debian | forky | fixed | 2.2.2-3 |
| debian | sid | fixed | 2.2.2-3 |
| debian | trixie | fixed | 2.2.2-3 |
References
- https://github.com/pallets/werkzeug/security/advisories/GHSA-xg9f-g7g7-2323
- https://nvd.nist.gov/vuln/detail/CVE-2023-25577
- https://github.com/pallets/werkzeug/commit/517cac5a804e8c4dc4ed038bb20dacd038e7a9f1
- https://github.com/pallets/werkzeug
- https://github.com/pallets/werkzeug/releases/tag/2.2.3
- https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-58.yaml
- https://security.netapp.com/advisory/ntap-20230818-0003
- https://www.debian.org/security/2023/dsa-5470
- https://www.suse.com/security/cve/CVE-2023-25577.html
- https://security-tracker.debian.org/tracker/CVE-2023-25577
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.