{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "10.11.0"
              },
              {
                "fixed": "10.11.11"
              },
              {
                "introduced": "11.2.0"
              },
              {
                "fixed": "11.2.3"
              },
              {
                "introduced": "11.3.0"
              },
              {
                "fixed": "11.3.1"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
            },
            {
              "fixed": "fddd4a70bcb32eaff394a2fa5399efcd1b2ae251"
            },
            {
              "introduced": "ab7b138824c61fe1fe815243d7e2a914dec49c8b"
            },
            {
              "fixed": "005521aa79666e6960bc3302f6172b810f6bff3a"
            },
            {
              "introduced": "d27a2195068ddfa3ce17cf470f9739e4edb94b83"
            },
            {
              "fixed": "4082c3dcf285e4d1a386d2ef37f14f39dc5a0094"
            }
          ],
          "repo": "https://github.com/mattermost/mattermost",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Mattermost",
    "cwe_ids": [
      "CWE-1287"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2454.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "11.3.0"
          },
          {
            "last_affected": "11.3.0"
          },
          {
            "introduced": "11.2.0"
          },
          {
            "last_affected": "11.2.2"
          },
          {
            "introduced": "10.11.0"
          },
          {
            "last_affected": "10.11.10"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Mattermost versions 11.3.x \u003c= 11.3.0, 11.2.x \u003c= 11.2.2, 10.11.x \u003c= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537",
  "id": "CVE-2026-2454",
  "modified": "2026-07-15T01:49:11.162226702Z",
  "published": "2026-03-16T20:10:16.644Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2454.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mattermost.com/security-updates"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2454"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "DoS in Calls plugin via malformed msgpack in websocket request."
}