{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-42587",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-42587",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-13T18:22:21.699Z",
    "updatedAt": "2026-09-18T12:04:49.045Z",
    "importedAt": "2026-10-24T01:58:08.712Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy enables decompression bomb DoS",
      "summary": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.",
      "affected": [
        {
          "vendor": "netty",
          "product": "netty",
          "versions": [
            {
              "version": ">= 4.2.0.Alpha1, < 4.2.13.Final",
              "status": "affected"
            },
            {
              "version": "< 4.1.133.Final",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "io.netty",
          "product": "netty-codec-http",
          "versions": [
            {
              "version": ">= 4.2.0.Alpha1, < 4.2.13.Final",
              "status": "affected"
            },
            {
              "version": "< 4.1.133.Final",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "io.netty",
          "product": "netty-codec-http2",
          "versions": [
            {
              "version": ">= 4.2.0.Alpha1, < 4.2.13.Final",
              "status": "affected"
            },
            {
              "version": "< 4.1.133.Final",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}