{"cve":"CVE-2026-70493","nvd":{"published":"2026-08-04T21:16:38.327","modified":"2026-09-18T14:45:36.047","status":"Analyzed","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the built-in knowledge search path in backend/open_webui/tools/knowledge_fs.py and backend/open_webui/tools/builtin.py let a chat participant choose a pattern used to grep knowledge files. Patterns containing regex metacharacters were compiled with Python's backtracking re engine and run against every line of every reachable file with no time limit, so a crafted pattern such as (x|x)*y and one matching uploaded file line can pin one CPU core and block the event loop. This causes availability impact for every other user of the affected worker. This issue is fixed in 0.11.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-1333"],"references":["https://github.com/open-webui/open-webui/commit/3ab2026262ef6f09810e4d235c5f9a9cb903e595","https://github.com/open-webui/open-webui/pull/27471","https://github.com/open-webui/open-webui/releases/tag/v0.11.0","https://github.com/open-webui/open-webui/security/advisories/GHSA-2f54-p244-32q6","https://github.com/open-webui/open-webui/security/advisories/GHSA-2f54-p244-32q6"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-70493","score":0.00592,"percentile":0.48326,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2f54-p244-32q6","url":"https://osv.dev/vulnerability/GHSA-2f54-p244-32q6","summary":"Open WebUI: Any authenticated user can stall a worker via a knowledge-search pattern that backtracks catastrophically","modified":"2026-08-10T11:40:43.299795874Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.6 <0.11.0"],"fixed":["0.11.0"]}]},{"id":"PYSEC-2026-3637","url":"https://osv.dev/vulnerability/PYSEC-2026-3637","summary":"Open WebUI: Any authenticated user can stall a worker via a knowledge-search pattern that backtracks catastrophically","modified":"2026-08-10T11:30:13.398637561Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.9.6 <0.11.0"],"fixed":["0.11.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}