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Vulnerabilities
Vulnerable Software

Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.3%
CVSS Severity
CVSS v3 Score 8.9
Products affected by CVE-2026-23527
  • H3 » H3 » Version: 0.0.1
    cpe:2.3:a:h3:h3:0.0.1
  • H3 » H3 » Version: 0.0.10
    cpe:2.3:a:h3:h3:0.0.10
  • H3 » H3 » Version: 0.0.11
    cpe:2.3:a:h3:h3:0.0.11
  • H3 » H3 » Version: 0.0.12
    cpe:2.3:a:h3:h3:0.0.12
  • H3 » H3 » Version: 0.0.13
    cpe:2.3:a:h3:h3:0.0.13
  • H3 » H3 » Version: 0.0.14
    cpe:2.3:a:h3:h3:0.0.14
  • H3 » H3 » Version: 0.0.15
    cpe:2.3:a:h3:h3:0.0.15
  • H3 » H3 » Version: 0.0.2
    cpe:2.3:a:h3:h3:0.0.2
  • H3 » H3 » Version: 0.0.3
    cpe:2.3:a:h3:h3:0.0.3
  • H3 » H3 » Version: 0.0.4
    cpe:2.3:a:h3:h3:0.0.4
  • H3 » H3 » Version: 0.0.5
    cpe:2.3:a:h3:h3:0.0.5
  • H3 » H3 » Version: 0.0.6
    cpe:2.3:a:h3:h3:0.0.6
  • H3 » H3 » Version: 0.0.7
    cpe:2.3:a:h3:h3:0.0.7
  • H3 » H3 » Version: 0.0.8
    cpe:2.3:a:h3:h3:0.0.8
  • H3 » H3 » Version: 0.0.9
    cpe:2.3:a:h3:h3:0.0.9
  • H3 » H3 » Version: 0.2.0
    cpe:2.3:a:h3:h3:0.2.0
  • H3 » H3 » Version: 0.2.1
    cpe:2.3:a:h3:h3:0.2.1
  • H3 » H3 » Version: 0.2.10
    cpe:2.3:a:h3:h3:0.2.10
  • H3 » H3 » Version: 0.2.11
    cpe:2.3:a:h3:h3:0.2.11
  • H3 » H3 » Version: 0.2.12
    cpe:2.3:a:h3:h3:0.2.12
  • H3 » H3 » Version: 0.2.2
    cpe:2.3:a:h3:h3:0.2.2
  • H3 » H3 » Version: 0.2.3
    cpe:2.3:a:h3:h3:0.2.3
  • H3 » H3 » Version: 0.2.4
    cpe:2.3:a:h3:h3:0.2.4
  • H3 » H3 » Version: 0.2.5
    cpe:2.3:a:h3:h3:0.2.5
  • H3 » H3 » Version: 0.2.6
    cpe:2.3:a:h3:h3:0.2.6
  • H3 » H3 » Version: 0.2.7
    cpe:2.3:a:h3:h3:0.2.7
  • H3 » H3 » Version: 0.2.8
    cpe:2.3:a:h3:h3:0.2.8
  • H3 » H3 » Version: 0.2.9
    cpe:2.3:a:h3:h3:0.2.9
  • H3 » H3 » Version: 0.3.0
    cpe:2.3:a:h3:h3:0.3.0
  • H3 » H3 » Version: 0.3.1
    cpe:2.3:a:h3:h3:0.3.1
  • H3 » H3 » Version: 0.3.2
    cpe:2.3:a:h3:h3:0.3.2
  • H3 » H3 » Version: 0.3.3
    cpe:2.3:a:h3:h3:0.3.3
  • H3 » H3 » Version: 0.3.4
    cpe:2.3:a:h3:h3:0.3.4
  • H3 » H3 » Version: 0.3.5
    cpe:2.3:a:h3:h3:0.3.5
  • H3 » H3 » Version: 0.3.6
    cpe:2.3:a:h3:h3:0.3.6
  • H3 » H3 » Version: 0.3.7
    cpe:2.3:a:h3:h3:0.3.7
  • H3 » H3 » Version: 0.3.8
    cpe:2.3:a:h3:h3:0.3.8
  • H3 » H3 » Version: 0.3.9
    cpe:2.3:a:h3:h3:0.3.9
  • H3 » H3 » Version: 0.4.0
    cpe:2.3:a:h3:h3:0.4.0
  • H3 » H3 » Version: 0.4.1
    cpe:2.3:a:h3:h3:0.4.1
  • H3 » H3 » Version: 0.4.2
    cpe:2.3:a:h3:h3:0.4.2
  • H3 » H3 » Version: 0.5.0
    cpe:2.3:a:h3:h3:0.5.0
  • H3 » H3 » Version: 0.5.1
    cpe:2.3:a:h3:h3:0.5.1
  • H3 » H3 » Version: 0.5.2
    cpe:2.3:a:h3:h3:0.5.2
  • H3 » H3 » Version: 0.5.3
    cpe:2.3:a:h3:h3:0.5.3
  • H3 » H3 » Version: 0.5.4
    cpe:2.3:a:h3:h3:0.5.4
  • H3 » H3 » Version: 0.5.5
    cpe:2.3:a:h3:h3:0.5.5
  • H3 » H3 » Version: 0.5.6
    cpe:2.3:a:h3:h3:0.5.6
  • H3 » H3 » Version: 0.5.7
    cpe:2.3:a:h3:h3:0.5.7
  • H3 » H3 » Version: 0.6.0
    cpe:2.3:a:h3:h3:0.6.0
  • H3 » H3 » Version: 0.7.0
    cpe:2.3:a:h3:h3:0.7.0
  • H3 » H3 » Version: 0.7.1
    cpe:2.3:a:h3:h3:0.7.1
  • H3 » H3 » Version: 0.7.10
    cpe:2.3:a:h3:h3:0.7.10
  • H3 » H3 » Version: 0.7.11
    cpe:2.3:a:h3:h3:0.7.11
  • H3 » H3 » Version: 0.7.12
    cpe:2.3:a:h3:h3:0.7.12
  • H3 » H3 » Version: 0.7.13
    cpe:2.3:a:h3:h3:0.7.13
  • H3 » H3 » Version: 0.7.14
    cpe:2.3:a:h3:h3:0.7.14
  • H3 » H3 » Version: 0.7.15
    cpe:2.3:a:h3:h3:0.7.15
  • H3 » H3 » Version: 0.7.16
    cpe:2.3:a:h3:h3:0.7.16
  • H3 » H3 » Version: 0.7.17
    cpe:2.3:a:h3:h3:0.7.17
  • H3 » H3 » Version: 0.7.18
    cpe:2.3:a:h3:h3:0.7.18
  • H3 » H3 » Version: 0.7.19
    cpe:2.3:a:h3:h3:0.7.19
  • H3 » H3 » Version: 0.7.2
    cpe:2.3:a:h3:h3:0.7.2
  • H3 » H3 » Version: 0.7.20
    cpe:2.3:a:h3:h3:0.7.20
  • H3 » H3 » Version: 0.7.21
    cpe:2.3:a:h3:h3:0.7.21
  • H3 » H3 » Version: 0.7.3
    cpe:2.3:a:h3:h3:0.7.3
  • H3 » H3 » Version: 0.7.4
    cpe:2.3:a:h3:h3:0.7.4
  • H3 » H3 » Version: 0.7.5
    cpe:2.3:a:h3:h3:0.7.5
  • H3 » H3 » Version: 0.7.6
    cpe:2.3:a:h3:h3:0.7.6
  • H3 » H3 » Version: 0.7.7
    cpe:2.3:a:h3:h3:0.7.7
  • H3 » H3 » Version: 0.7.8
    cpe:2.3:a:h3:h3:0.7.8
  • H3 » H3 » Version: 0.7.9
    cpe:2.3:a:h3:h3:0.7.9
  • H3 » H3 » Version: 0.8.0
    cpe:2.3:a:h3:h3:0.8.0
  • H3 » H3 » Version: 0.8.1
    cpe:2.3:a:h3:h3:0.8.1
  • H3 » H3 » Version: 0.8.2
    cpe:2.3:a:h3:h3:0.8.2
  • H3 » H3 » Version: 0.8.3
    cpe:2.3:a:h3:h3:0.8.3
  • H3 » H3 » Version: 0.8.4
    cpe:2.3:a:h3:h3:0.8.4
  • H3 » H3 » Version: 0.8.5
    cpe:2.3:a:h3:h3:0.8.5
  • H3 » H3 » Version: 0.8.6
    cpe:2.3:a:h3:h3:0.8.6
  • H3 » H3 » Version: 1.0.0
    cpe:2.3:a:h3:h3:1.0.0
  • H3 » H3 » Version: 1.0.1
    cpe:2.3:a:h3:h3:1.0.1
  • H3 » H3 » Version: 1.0.2
    cpe:2.3:a:h3:h3:1.0.2
  • H3 » H3 » Version: 1.1.0
    cpe:2.3:a:h3:h3:1.1.0
  • H3 » H3 » Version: 1.10.0
    cpe:2.3:a:h3:h3:1.10.0
  • H3 » H3 » Version: 1.10.1
    cpe:2.3:a:h3:h3:1.10.1
  • H3 » H3 » Version: 1.10.2
    cpe:2.3:a:h3:h3:1.10.2
  • H3 » H3 » Version: 1.11.0
    cpe:2.3:a:h3:h3:1.11.0
  • H3 » H3 » Version: 1.11.1
    cpe:2.3:a:h3:h3:1.11.1
  • H3 » H3 » Version: 1.12.0
    cpe:2.3:a:h3:h3:1.12.0
  • H3 » H3 » Version: 1.13.0
    cpe:2.3:a:h3:h3:1.13.0
  • H3 » H3 » Version: 1.13.1
    cpe:2.3:a:h3:h3:1.13.1
  • H3 » H3 » Version: 1.14.0
    cpe:2.3:a:h3:h3:1.14.0
  • H3 » H3 » Version: 1.15.0
    cpe:2.3:a:h3:h3:1.15.0
  • H3 » H3 » Version: 1.15.1
    cpe:2.3:a:h3:h3:1.15.1
  • H3 » H3 » Version: 1.15.2
    cpe:2.3:a:h3:h3:1.15.2
  • H3 » H3 » Version: 1.15.3
    cpe:2.3:a:h3:h3:1.15.3
  • H3 » H3 » Version: 1.15.4
    cpe:2.3:a:h3:h3:1.15.4
  • H3 » H3 » Version: 1.2.0
    cpe:2.3:a:h3:h3:1.2.0
  • H3 » H3 » Version: 1.2.1
    cpe:2.3:a:h3:h3:1.2.1
  • H3 » H3 » Version: 1.3.0
    cpe:2.3:a:h3:h3:1.3.0
  • H3 » H3 » Version: 1.4.0
    cpe:2.3:a:h3:h3:1.4.0
  • H3 » H3 » Version: 1.5.0
    cpe:2.3:a:h3:h3:1.5.0
  • H3 » H3 » Version: 1.6.0
    cpe:2.3:a:h3:h3:1.6.0
  • H3 » H3 » Version: 1.6.1
    cpe:2.3:a:h3:h3:1.6.1
  • H3 » H3 » Version: 1.6.2
    cpe:2.3:a:h3:h3:1.6.2
  • H3 » H3 » Version: 1.6.3
    cpe:2.3:a:h3:h3:1.6.3
  • H3 » H3 » Version: 1.6.4
    cpe:2.3:a:h3:h3:1.6.4
  • H3 » H3 » Version: 1.6.5
    cpe:2.3:a:h3:h3:1.6.5
  • H3 » H3 » Version: 1.6.6
    cpe:2.3:a:h3:h3:1.6.6
  • H3 » H3 » Version: 1.7.0
    cpe:2.3:a:h3:h3:1.7.0
  • H3 » H3 » Version: 1.7.1
    cpe:2.3:a:h3:h3:1.7.1
  • H3 » H3 » Version: 1.8.0
    cpe:2.3:a:h3:h3:1.8.0
  • H3 » H3 » Version: 1.8.1
    cpe:2.3:a:h3:h3:1.8.1
  • H3 » H3 » Version: 1.8.2
    cpe:2.3:a:h3:h3:1.8.2
  • H3 » H3 » Version: 1.9.0
    cpe:2.3:a:h3:h3:1.9.0


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