title: Possible Denial of Service Vulnerability in Rack Header Parsing
description: Rack is a modular Ruby web server interface. Carefully crafted headers can cause header parsing in Rack to take longer than expected resulting in a possible denial of service issue. Accept and Forwarded headers are impacted. Ruby 3.2 has mitigations for this problem, so Rack applications using Ruby 3.2 or newer are unaffected. This vulnerability is fixed in 2.0.9.4, 2.1.4.4, 2.2.8.1, and 3.0.9.1.
problem types: CWE-1333: Inefficient Regular Expression Complexity
affected:
{
vendor: rack
product: rack
versions:
version: >= 3.0.0, < 3.0.9.1, status: affected
version: >= 2.2.0, < 2.2.8.1, status: affected
version: >= 2.1.0, < 2.1.4.4, status: affected
version: < 2.0.9.4, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
version: 3.1
]