Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex

{
  "id": "1c9b14a5f0e67df14a5fcd33966c0f47c85f15c781ad65efcb2cc06ba1442c7c",
  "url": "https://osv.dev/vulnerability/CVE-2026-109298",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex",
    "summary": "Open WebUI 0.11.0 before 0.11.4 compiles user-chosen grep patterns for its knowledge and chat file search tools with a regex engine that expands nested counted repetition unbounded at compile time and caches the result. Authenticated users can have the model call grep_knowledge_files with short nested-repetition patterns, blocking the event loop and exhausting worker memory.",
    "evidence": "osv:CVE-2026-109298",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-109298",
      "aliases": [
        "CVE-2026-109298",
        "GHSA-gww9-mhgj-pfqh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-webui/open-webui",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f9590b8017199e56d5e953657e6498e3cef1d246"
                },
                {
                  "fixed": "8bd8b4fac5e059578ac0c74b3c18d11139f88b7d"
                },
                {
                  "fixed": "97e013a66169c4fcd7f26ab9e41a4ff260ffd4da"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.11.0"
                      },
                      {
                        "fixed": "0.11.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "97e013a66169c4fcd7f26ab9e41a4ff260ffd4da"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.11.3",
            "v0.11.2",
            "v0.11.1",
            "v0.11.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109298.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.570743318Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109298.json",
        "https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-109298",
        "https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-memory-exhaustion-via-knowledge-search-regex",
        "https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400",
          "CWE-770"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109298.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-109298",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521433,
  "published_at": "2026-10-12T16:04:56.895+00:00"
}