{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0.9.2"
              },
              {
                "fixed": "0.10.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "8dae237a0bfdac4b7f55b463b3e2769ea4b94a0b"
            },
            {
              "fixed": "4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c"
            },
            {
              "fixed": "61a26722155ec6ee1b629cf8dfcf975098c18331"
            }
          ],
          "repo": "https://github.com/open-webui/open-webui",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-ffpj-xv5c-p3gw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59220.json"
  },
  "details": "Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.2 before 0.10.0, the SKILL_MENTION_RE and strip_re regular expressions in backend/open_webui/utils/middleware.py parsed \u003c$skillId|label\u003e skill mentions with overlapping quantifiers, allowing an authenticated chat message containing \u003c$ without a closing \u003e to trigger quadratic backtracking and block the asyncio event loop. This issue is fixed in version 0.10.0.",
  "id": "CVE-2026-59220",
  "modified": "2026-07-15T01:49:16.514748564Z",
  "published": "2026-07-09T16:09:41.127Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-webui/open-webui/releases/tag/v0.10.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59220.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-ffpj-xv5c-p3gw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59220"
    },
    {
      "type": "FIX",
      "url": "https://github.com/open-webui/open-webui/commit/61a26722155ec6ee1b629cf8dfcf975098c18331"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config"
}