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I. Basic Information for CVE-2026-23527
Vulnerability Information

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Vulnerability Title
h3 v1 has Request Smuggling (TE.TE) issue
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
H3 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H3是H3开源的一个HTTP框架。 H3 1.15.5之前版本存在环境问题漏洞,该漏洞源于Transfer-Encoding标头检查严格区分大小写,可能导致HTTP请求夹带攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
h3jsh3 < 1.15.5 -
II. Public POCs for CVE-2026-23527
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III. Intelligence Information for CVE-2026-23527
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IV. Related Vulnerabilities
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