{"id":"CVE-2026-109298","title":"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","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 use…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"published":"2026-10-12","updated":"2026-10-13","sourceUpdated":"2026-10-13T20:39:48.767","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109298","references":[{"url":"https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da","label":"disclosure@vulncheck.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-memory-exhaustion-via-knowledge-search-regex","label":"disclosure@vulncheck.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00469,"epssPercentile":0.40379,"ingestedAt":"2026-10-12T18:00:08.193Z","vendor":"open-webui","product":"open-webui","affected":["open-webui >= 0.11.0 < 0.11.4"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-13T15:45:40.918439Z"},"slug":"CVE-2026-109298","body":"## Overview\n\nOpen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":220948,"id":"CVE-2026-109298","ts":1792026938805,"field":"exploit_available","old":"false","new":"true"}]}