VULNERABILITY INTELLIGENCE

CVE-2026-23527

CVSS score8.9 HIGH
EPSS probability0.63%
CISA KEVNot currently listed
Published2026-01-15
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Description

H3 is a minimal H(TTP) 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 header should be case-insensitive. This vulnerability is fixed in 1.15.5.

Weakness classification

  • security-advisories@github.com: CWE-444

Primary references