Is CVE-2026-66753 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66753?

CVE-2026-66753 has a CVSS v3 severity of LOW (3.7).

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CVE-2026-66753

Description

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.