CVE-2022-44572 Denial of service via multipart parsing in Rack
Attackers can cause denial of service in Rack-based applications by crafting input that triggers excessive processing time during multipart boundary parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-44572?
CVE-2022-44572 is a high-severity denial of service vulnerability in https://github.com/rack/rack, published on 9 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial of service vulnerability in the multipart parsing component of Rack fixed in 2.0.9.2, 2.1.4.2, 2.2.4.1 and 3.0.0.1 could allow an attacker tocraft input that can cause RFC2183 multipart boundary parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted.
Which versions are affected by CVE-2022-44572?
8 open source packages ship an affected version, including rack. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rack RubyGems | From 2.0.0 | 2.0.9.2 |
rack RubyGems | From 2.0.0 | 2.0.9.2 |
rack RubyGems | From 2.1.0.0 | 2.1.4.2 |
rack RubyGems | From 2.1.0.0 | 2.1.4.2 |
rack RubyGems | From 2.2.0.0 | 2.2.6.1 |
rack RubyGems | From 2.2.0.0 | 2.2.6.1 |
2 more packages
rack RubyGems | From 3.0.0.0 | 3.0.4.1 |
rack RubyGems | From 3.0.0.0 | 3.0.4.1 |
Products include Rack Rack.
How do I fix CVE-2022-44572?
Upgrade rack to a fixed version for your release line: 2.0.9.2, 2.1.4.2, 2.2.6.1 or 3.0.4.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-44572 being exploited?
There is no known exploitation of CVE-2022-44572 in the wild and no public exploit code.
Other vulnerabilities in https://github.com/rack/rack
- CVE-2026-34785 Rack: Local file inclusion in `Rack::Static` via URL Prefix Matching
- CVE-2026-34827 Rack: Algorithmic-Complexity DoS in Rack::Multipart::Parser
- CVE-2026-34829 Rack: Denial of Service via Unbounded Multipart File Upload Without Content-Length
- CVE-2026-22860 Rack has a Directory Traversal via Rack:Directory
- CVE-2025-61919 Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing
Sources
Also known as DEBIAN-CVE-2022-44572, GHSA-rqv2-275x-2jq5, UBUNTU-CVE-2022-44572.