CVE-2026-42583

{
  "id": "CVE-2026-42583",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-13T19:17:23.903",
  "lastModified": "2026-10-26T17:10:03.270",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final."
    },
    {
      "lang": "es",
      "value": "Netty es un framework de aplicación de red asíncrono y basado en eventos. Antes de 4.2.13.Final y 4.1.133.Final, Lz4FrameDecoder asigna un ByteBuf del tamaño decompressedLength (hasta 32 MB por bloque) antes de que se ejecute LZ4. Un par solo necesita una cabecera de 21 bytes más los bytes de carga útil compressedLength - 22 bytes si compressedLength == 1 - para forzar esa asignación. Esta vulnerabilidad se corrige en 4.2.13.Final y 4.1.133.Final."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "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",
          "versions": [
            {
              "version": "< 4.1.133.Final",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "io.netty",
          "product": "netty-codec-compression",
          "versions": [
            {
              "version": "< 4.2.13.Final",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-14T15:40:38.960180Z",
          "id": "CVE-2026-42583",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "4.1.133",
              "matchCriteriaId": "DFE205A5-2C43-40C9-A2FF-CF6759B8D861"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.2.0",
              "versionEndExcluding": "4.2.13",
              "matchCriteriaId": "D94A720F-9CED-4BE9-8C37-FD9E2FD28472"
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  ],
  "references": [
    {
      "url": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}