Zip Bomb Denial of Service via Unrestricted Archive Decompression

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-3114",
    "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
    "assignerShortName": "Mattermost",
    "dateUpdated": "2026-03-26T17:51:14.833Z",
    "dateReserved": "2026-02-24T11:01:47.197Z",
    "datePublished": "2026-03-26T16:21:19.421Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "shortName": "Mattermost",
        "dateUpdated": "2026-03-26T16:21:19.421Z"
      },
      "title": "Zip Bomb Denial of Service via Unrestricted Archive Decompression",
      "descriptions": [
        {
          "lang": "en",
          "value": "Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory.. Mattermost Advisory ID: MMSA-2026-00598"
        }
      ],
      "affected": [
        {
          "vendor": "Mattermost",
          "product": "Mattermost",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "11.4.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "11.4.0"
            },
            {
              "version": "11.3.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "11.3.1"
            },
            {
              "version": "11.2.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "11.2.3"
            },
            {
              "version": "10.11.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "10.11.11"
            },
            {
              "version": "11.5.0",
              "status": "unaffected"
            },
            {
              "version": "11.4.1",
              "status": "unaffected"
            },
            {
              "version": "11.3.2",
              "status": "unaffected"
            },
            {
              "version": "11.2.4",
              "status": "unaffected"
            },
            {
              "version": "10.11.12",
              "status": "unaffected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)",
              "cweId": "CWE-409",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://mattermost.com/security-updates",
          "name": "MMSA-2026-00598",
          "tags": [
            "vendor-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ],
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM"
          }
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Update Mattermost to versions 11.5.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "winfunc",
          "type": "finder"
        }
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-03-26T17:51:14.833Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
          {}
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      }
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  }
}