{"id":"CVE-2026-109298","published":"2026-10-12T17:17:23.390","lastModified":"2026-10-13T20:39:48.767","description":"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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-400"],"vendors":[],"products":[],"references":[{"url":"https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","tags":[]},{"url":"https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-memory-exhaustion-via-knowledge-search-regex","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","tags":[]}],"exploitRefs":[{"url":"https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","tags":[]},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","tags":[]}],"hasPoc":true,"ai":null}