CVE-2026-109295CWE-1333

CVE-2026-109295

Medium · published October 12, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
18.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00272 · 18.6th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-10-12T21:17Z
References (3)
https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r · [email protected]https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-redos-via-grep-knowledge-files-event-loop · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
    cvelistv5