CVE-2026-23527

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-444

Affected software

No affected versions have been published.

Timeline

Published: Jan 15, 2026
Last modified: Jun 17, 2026
NVD status: Modified

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