CVE-2025-55152: Oakserver Oak

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

oak is a middleware framework for Deno's native HTTP server, Deno Deploy, Node.js 16.5 and later, Cloudflare Workers and Bun. In versions 17.1.5 and below, it's possible to significantly slow down an oak server with specially crafted values of the x-forwarded-proto or x-forwarded-for headers.

Affected products

• Oakserver Oak: before 17.1.6 (fixed in 17.1.6)

Published 2025-08-09. Last modified 2026-06-17.