CVE-2026-109298

6.5Medium

Published 12 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

6.5Medium

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: High impact on availability
Weakness: CWE-400

Impact

Authenticated users can crash Open WebUI workers and freeze the application by triggering high-memory regex operations. Attackers only need basic network access and a valid account to issue the search queries.

Root cause

The knowledge and chat file search features compile user-supplied regex patterns with unbounded nested repetition expansion and cache the bloated results.

Affected systems

Open WebUI 0.11.0 before 0.11.4

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fix & remediation

Upgrade Open WebUI to version 0.11.4 or later. If patching immediately is not possible, disable the grep_knowledge_files tool or restrict access to untrusted users.

shell

$ pip install --upgrade open-webui>=0.11.4

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD 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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109298