Resource exhaustion in Open-Webui
CVE-2026-109298
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.
Vulnerability class: DoS (Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-109298?
- CVE-2026-109298 is a medium-severity vulnerability in Open-Webui, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-12.
- How severe is CVE-2026-109298?
- Medium severity. CVSS v3 base score is 6.5 out of 10.