CVE-2026-109298CWE-400CWE-770denial-of-service

CVE-2026-109298

Medium · published October 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
32.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
0.00393 · 32.2th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-10-12T21:17Z
References (4)
https://github.com/open-webui/open-webui/commit/97e013a66169c4fcd7f26ab9e41a4ff260ffd4da · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh · [email protected]https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-memory-exhaustion-via-knowledge-search-regex · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-gww9-mhgj-pfqh · 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 Memory Exhaustion via Knowledge Search Regex
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex
    cvelistv5