CVE-2026-109295

MEDIUM 6.5

Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.

CWE	CWE-1333
Vendor	open-webui
Product	open-webui
Published	Oct 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

open-webui / open-webui

0.11.0 < 0.11.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r vulncheck.com: https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-redos-via-grep-knowledge-files-event-loop

Credits

yousif-IQ Classic298