CVE-2025-55152

oak: ReDoS in x-forwarded-proto and x-forwarded-for headers

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

oakserver · oak

CVSS v3.1 GITHUB

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.39% chance of exploitation in the next 30 days, 31st percentile

Published

2025-08-09

Updated

2025-08-11

Proof-of-concept exploits (1)

• advisories/GHSA-r3v7-pc4g-7xp9

References

• CVE Record
• NVD entry