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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-mp2g-9vg9-f4cg h3 v1 has Request Smuggling (TE.TE) issue
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 15 Jan 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 15 Jan 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title Request Smuggling (TE.TE) in h3 v1
Weaknesses CWE-444
References
Metrics cvssV3_1

{'score': 8.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-15T20:00:06.302Z

Reserved: 2026-01-13T18:22:43.981Z

Link: CVE-2026-23527

cve-icon Vulnrichment

Updated: 2026-01-15T19:59:59.151Z

cve-icon NVD

Status : Received

Published: 2026-01-15T20:16:05.620

Modified: 2026-01-15T20:16:05.620

Link: CVE-2026-23527

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses