CVE-2026-23527

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.8 / 10

Vector String

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

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.

Vulnerability Details

Published Date

January 15, 2026

Last Modified

January 23, 2026

CWE ID

CWE-444

Source

NVD

Vendor

Product

External References

https://github.com/h3js/h3/commit/618ccf4f37b8b6148bea7f36040471af45bfb097
https://github.com/h3js/h3/security/advisories/GHSA-mp2g-9vg9-f4cg

CVE-2026-23527

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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