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CVE-2026-23527

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.9 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • h3

    Versions
    • < 1.15.5: Affected

    No fix published

  • h3 npm

    Affected ranges
    • SEMVER: < 1.15.5

    Update to 1.15.5

Original sources

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