What’s Vulnerable › Vulnerabilities
CVE-2023-27530: Rack has possible DoS Vulnerability in Multipart MIME parsing
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-03-10 · updated 2026-10-24
- Weakness: CWE-400
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.
Affected products
- Debian Linux: 10.0, 11.0
- rack: before 2.0.9.3; from 2.1.0 before 2.1.4.3; from 2.2.0 before 2.2.6.3; from 3.0.0 before 3.0.4.2 — fixed in 2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2
- Rubygems Rack: before 2.0.9.3; from 2.1.0 before 2.1.4.3; from 2.2.0 before 2.2.6.3; from 3.0.0 before 3.0.4.2; 0.1.0, 0.2.0, 0.3.0, 0.4.0, 0.9.0, 0.9.1 (+100) — fixed in 2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2
How to fix
Upgrade to a fixed version: rack 2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2; Rubygems Rack 2.0.9.3, 2.1.4.3, 2.2.6.3, 3.0.4.2. Check the vendor advisory for mitigations.
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://security.netapp.com/advisory/ntap-20231208-0015/
- https://www.debian.org/security/2023/dsa-5530
- 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://security.netapp.com/advisory/ntap-20231208-0015/
- https://www.debian.org/security/2023/dsa-5530
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