Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109298Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 59.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	0.11.0 – before 0.11.4

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-gww9-mhgj-pfqh) vendor-advisory
Patch Commit patch
VulnCheck Advisory: Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex third-party-advisory