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CVE-2026-23527— h3 v1 has Request Smuggling (TE.TE) issue

Quick assessment

Affected
h3js h3
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.9 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
h3js h3 < 1.15.5 -

II. Public POCs for CVE-2026-23527

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5723 chars
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-23527

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Vendor Advisories for CVE-2026-23527 (1)

Security Blog Posts for CVE-2026-23527 (1)

IV. Related Vulnerabilities

Same product: h3
Same vendor: h3js
Same weakness: CWE-444

V. Comments for CVE-2026-23527

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