CVE-2026-66753
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
The tiny-http library up to version 0.12.0 has an HTTP header injection vulnerability, allowing attackers to inject CR and LF bytes into header values. Insufficient validation leads to response splitting, cache poisoning, session fixation, and request smuggling.
Risk Assessment
Attackers can hijack user sessions, alter server response content, or bypass security controls, compromising data confidentiality and integrity.
Recommendation
Update the tiny-http library to a version later than 0.12.0 that includes header validation fixes.
Original NVD description (English source)
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.