Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109295Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop

Medium 4.3

In plain English

A medium-severity regular-expression denial of service 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 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 73.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

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

Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-gfjp-5hc9-852r) vendor-advisory
VulnCheck Advisory: Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop third-party-advisory