CVE-2026-42583 (GCVE-0-2026-42583)

Vulnerability from cvelistv5 – Published: 2026-05-13 18:09 – Updated: 2026-05-14 15:41
VLAI
Title
Netty: Lz4FrameDecoder resource exhaustion
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Alpha1, < 4.2.13.Final
Affected: < 4.1.133.Final
Create a notification for this product.
io.netty netty-codec Affected: < 4.1.133.Final
Create a notification for this product.
io.netty netty-codec-compression Affected: < 4.2.13.Final
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42583",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T15:40:38.960180Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-14T15:41:07.253Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "netty",
          "vendor": "netty",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.2.0.Alpha1, \u003c 4.2.13.Final"
            },
            {
              "status": "affected",
              "version": "\u003c 4.1.133.Final"
            }
          ]
        },
        {
          "product": "netty-codec",
          "vendor": "io.netty",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.1.133.Final"
            }
          ]
        },
        {
          "product": "netty-codec-compression",
          "vendor": "io.netty",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.2.13.Final"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T18:09:19.817Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6"
        }
      ],
      "source": {
        "advisory": "GHSA-mj4r-2hfc-f8p6",
        "discovery": "UNKNOWN"
      },
      "title": "Netty: Lz4FrameDecoder resource exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42583",
    "datePublished": "2026-05-13T18:09:19.817Z",
    "dateReserved": "2026-04-28T17:26:12.086Z",
    "dateUpdated": "2026-05-14T15:41:07.253Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-42583",
      "date": "2026-07-14",
      "epss": "0.00429",
      "percentile": "0.34633"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-42583\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-05-13T19:17:23.903\",\"lastModified\":\"2026-06-17T10:48:05.550\",\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"netty\",\"product\":\"netty\",\"versions\":[{\"version\":\"\u003e= 4.2.0.Alpha1, \u003c 4.2.13.Final\",\"status\":\"affected\"},{\"version\":\"\u003c 4.1.133.Final\",\"status\":\"affected\"}]},{\"vendor\":\"io.netty\",\"product\":\"netty-codec\",\"versions\":[{\"version\":\"\u003c 4.1.133.Final\",\"status\":\"affected\"}]},{\"vendor\":\"io.netty\",\"product\":\"netty-codec-compression\",\"versions\":[{\"version\":\"\u003c 4.2.13.Final\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"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\":\"security-advisories@github.com\",\"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\"}]}]}],\"references\":[{\"url\":\"https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6\",\"source\":\"security-advisories@github.com\",\"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\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-14T17:42:10+00:00",
      "cve": "CVE-2026-42583",
      "id": "CVE-2026-42583",
      "initial_release_date": "2026-05-13T18:09:19.817000+00:00",
      "product_status:fixed": "5",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "87",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "netty: io.netty/netty-codec-compression: io.netty/netty-codec: Netty: Denial of Service via excessive memory allocation in LZ4FrameDecoder",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42583.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42583\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-14T15:40:38.960180Z\"}}}], \"references\": [{\"url\": \"https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-14T15:40:59.151Z\"}}], \"cna\": {\"title\": \"Netty: Lz4FrameDecoder resource exhaustion\", \"source\": {\"advisory\": \"GHSA-mj4r-2hfc-f8p6\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"netty\", \"product\": \"netty\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 4.2.0.Alpha1, \u003c 4.2.13.Final\"}, {\"status\": \"affected\", \"version\": \"\u003c 4.1.133.Final\"}]}, {\"vendor\": \"io.netty\", \"product\": \"netty-codec\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 4.1.133.Final\"}]}, {\"vendor\": \"io.netty\", \"product\": \"netty-codec-compression\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 4.2.13.Final\"}]}], \"references\": [{\"url\": \"https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6\", \"name\": \"https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770: Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-05-13T18:09:19.817Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42583\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-14T15:41:07.253Z\", \"dateReserved\": \"2026-04-28T17:26:12.086Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-05-13T18:09:19.817Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.