CVE-2026-66753: Tiny-HTTP

Low severity, CVSS 3.7. EPSS: 0.3% chance of exploitation in the next 30 days.

tiny-http through 0.12.0 contains an HTTP header injection vulnerability that allows attackers to inject carriage return (0x0D) and line feed (0x0A) bytes into HTTP header values on both request and response sides due to insufficient validation in header parsing and serialization. Attackers can exploit this injection primitive to perform response splitting, cache poisoning, session fixation via Set-Cookie injection, security header override, and request smuggling against line-feed-tolerant backends.

Affected products

• Tiny-HTTP Tiny-HTTP: up to and including 0.12.0

Published 2026-07-28. Last modified 2026-07-30.