CVE-2026-32284 (GCVE-0-2026-32284)

Vulnerability from cvelistv5 – Published: 2026-03-26 19:40 – Updated: 2026-03-30 14:55
VLAI?
Title
Denial of service in github.com/shamaton/msgpack
Summary
The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
Go
References
Impacted products
Vendor Product Version
github.com/shamaton/msgpack github.com/shamaton/msgpack Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-32284",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-30T14:04:12.686407Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-30T14:55:25.762Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "affected",
          "packageName": "github.com/shamaton/msgpack",
          "product": "github.com/shamaton/msgpack",
          "programRoutines": [
            {
              "name": "Unmarshal"
            },
            {
              "name": "UnmarshalAsMap"
            },
            {
              "name": "UnmarshalAsArray"
            },
            {
              "name": "DecodeStructAsArray"
            },
            {
              "name": "DecodeStructAsMap"
            }
          ],
          "vendor": "github.com/shamaton/msgpack"
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "affected",
          "packageName": "github.com/shamaton/msgpack/v2",
          "product": "github.com/shamaton/msgpack/v2",
          "programRoutines": [
            {
              "name": "Unmarshal"
            },
            {
              "name": "UnmarshalAsMap"
            },
            {
              "name": "UnmarshalAsArray"
            }
          ],
          "vendor": "github.com/shamaton/msgpack/v2"
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "affected",
          "packageName": "github.com/shamaton/msgpack/v3",
          "product": "github.com/shamaton/msgpack/v3",
          "programRoutines": [
            {
              "name": "Unmarshal"
            },
            {
              "name": "UnmarshalAsMap"
            },
            {
              "name": "UnmarshalAsArray"
            }
          ],
          "vendor": "github.com/shamaton/msgpack/v3"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-26T19:40:51.686Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://github.com/shamaton/msgpack/issues/59"
        },
        {
          "url": "https://github.com/golang/vulndb/issues/4513"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4513"
        }
      ],
      "title": "Denial of service in github.com/shamaton/msgpack"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-32284",
    "datePublished": "2026-03-26T19:40:51.686Z",
    "dateReserved": "2026-03-11T16:38:46.556Z",
    "dateUpdated": "2026-03-30T14:55:25.762Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-32284\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-03-26T20:16:12.087\",\"lastModified\":\"2026-03-30T15:16:27.780\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.\"},{\"lang\":\"es\",\"value\":\"El decodificador msgpack no valida correctamente la longitud del b\u00fafer de entrada al procesar datos fixext truncados (c\u00f3digos de formato 0xd4-0xd8). Esto puede provocar una lectura fuera de l\u00edmites y un p\u00e1nico en tiempo de ejecuci\u00f3n, lo que permite un ataque de denegaci\u00f3n de servicio.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"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}]},\"references\":[{\"url\":\"https://github.com/golang/vulndb/issues/4513\",\"source\":\"security@golang.org\"},{\"url\":\"https://github.com/shamaton/msgpack/issues/59\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4513\",\"source\":\"security@golang.org\"},{\"url\":\"https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-32284\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-30T14:04:12.686407Z\"}}}], \"references\": [{\"url\": \"https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-30T14:05:06.203Z\"}}], \"cna\": {\"title\": \"Denial of service in github.com/shamaton/msgpack\", \"affected\": [{\"vendor\": \"github.com/shamaton/msgpack\", \"product\": \"github.com/shamaton/msgpack\", \"packageName\": \"github.com/shamaton/msgpack\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"affected\", \"programRoutines\": [{\"name\": \"Unmarshal\"}, {\"name\": \"UnmarshalAsMap\"}, {\"name\": \"UnmarshalAsArray\"}, {\"name\": \"DecodeStructAsArray\"}, {\"name\": \"DecodeStructAsMap\"}]}, {\"vendor\": \"github.com/shamaton/msgpack/v2\", \"product\": \"github.com/shamaton/msgpack/v2\", \"packageName\": \"github.com/shamaton/msgpack/v2\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"affected\", \"programRoutines\": [{\"name\": \"Unmarshal\"}, {\"name\": \"UnmarshalAsMap\"}, {\"name\": \"UnmarshalAsArray\"}]}, {\"vendor\": \"github.com/shamaton/msgpack/v3\", \"product\": \"github.com/shamaton/msgpack/v3\", \"packageName\": \"github.com/shamaton/msgpack/v3\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"affected\", \"programRoutines\": [{\"name\": \"Unmarshal\"}, {\"name\": \"UnmarshalAsMap\"}, {\"name\": \"UnmarshalAsArray\"}]}], \"references\": [{\"url\": \"https://github.com/shamaton/msgpack/issues/59\"}, {\"url\": \"https://github.com/golang/vulndb/issues/4513\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4513\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-125: Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-03-26T19:40:51.686Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-32284\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-30T14:55:25.762Z\", \"dateReserved\": \"2026-03-11T16:38:46.556Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-03-26T19:40:51.686Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.