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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.
Use CWE-1333, Rack vendor hub and Rack product page to widen CVE-2024-26146 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34827, CVE-2026-34829 and CVE-2026-34785 for nearby disclosures in the same product family.