HTTP Request Smuggling

Overview h3 is a Minimal HTTP framework built for high performance and portability. Affected versions of this package are vulnerable to HTTP Request Smuggling via improper parsing of the Transfer-Encoding header in the readRawBody function. An attacker can bypass security controls and poison web...

CVE-2026-23527: Inconsistent Interpretation of HTTP Requests

H3 is a minimal HTTP framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive check for the Transfer-Encoding header. It explicitly looks for "chunked", but per the RFC, this heade...