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    CVE-2026-23527

    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.

    Published:Jan 15, 2026
    Last Modified:Apr 15, 2026
    EPS:Jan 15, 2026
    EPSS Score:0.00037
    CVSS Score:8.9

    Affected Products

    Vendor
    H3
    Product
    H3
    Vendor
    H3js
    Product
    H3

    Exploits

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

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High