ninenines cowboy

2 published vulnerabilities name this product.

As the CNAs write it in their CVE records (vendor and product); the versions are theirs.

CVEVulnerable versionsTitleSeverityPublishedEPSSExploitation
CVE-2026-656242.0.0-pre.4 – < 2.18.0Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory ExhaustionMEDIUM 6.90.4 %
CVE-2026-84662.0.0 – < 2.15.0Unbounded buffer accumulation in multipart header parsing causes denial of service in cowboyHIGH 8.20.4 %