FKIE_CVE-2026-23527

Vulnerability from fkie_nvd - Published: 2026-01-15 20:16 - Updated: 2026-01-23 18:50
Severity ?
8.9 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/h3js/h3/commit/618ccf4f37b8b6148bea7f36040471af45bfb097Patch
security-advisories@github.comhttps://github.com/h3js/h3/security/advisories/GHSA-mp2g-9vg9-f4cgExploit, Vendor Advisory
Impacted products
Vendor Product Version
h3 h3 *
To clipboard 

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    {
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              "criteria": "cpe:2.3:a:h3:h3:*:*:*:*:*:node.js:*:*",
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  "descriptions": [
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      "value": "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."
    }
  ],
  "id": "CVE-2026-23527",
  "lastModified": "2026-01-23T18:50:35.587",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 8.9,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L",
          "version": "3.1"
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        "impactScore": 6.0,
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        "type": "Secondary"
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  "references": [
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      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "security-advisories@github.com",
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    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.