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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da
https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh
https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-memory-exhaustion-via-knowledge-search-regex
https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh

Configurations

No configuration.

History

23 Oct 2026, 22:16

Type	Values Removed	Values Added
CWE		CWE-770

13 Oct 2026, 16:17

Type	Values Removed	Values Added
References	~~() https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh -~~	() https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh -

12 Oct 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-12 17:17

Updated : 2026-10-23 22:16

NVD link : CVE-2026-109298

Mitre link : CVE-2026-109298

CVE.ORG link : CVE-2026-109298

JSON object : View

Products Affected

No product.

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

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