PT-2026-65523 · Tinyhttpd · Tiny-Http

Theodosis Paidakis · CVE-2026-66753 · Published 2026-07-28 · Updated 2026-07-28

NVD

CVSS v3.1

3.7

Low

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Exploit

Fix

Weakness Enumeration

CWE-113

Related Identifiers

CVE-2026-66753

Affected Products

Tiny-Http

References · 3

• 🔥 https://github.com/theopaid/HTTP-Header-Injection-via-Unvalidated-CR-and-LF-in-Header-Values-tiny_http-/tree/master · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-66753 · Security Note
• https://vulncheck.com/advisories/tiny-http-http-response-splitting-via-header-injection · Note