TI-2026-71114 Aliases CVE-2026-109298 GHSA-x55j-pj79-2cgm

Memory exhaustion in Open WebUI knowledge search via regex patterns

MEDIUM 64CWE-400Published 2026-10-12 · Updated 2026-10-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

Open WebUI from 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 without bounds at compile time. Authenticated users can have the model call grep_knowledge_files with short nested-repetition patterns, which blocks the event loop and exhausts worker memory. The weakness is classified as CWE-400.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00469 40th percentileScored 2026-11-07

Fix Fixed open-webui (open-webui): 0.11.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
open-webui	open-webui	0.11.0 to before 0.11.4	0.11.4	Patch available	CNA

open-webui Vendoropen-webui Affected 0.11.0 to before 0.11.4 Fixed in 0.11.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:openwebui:open_webui::::::::	—	—	open-webui

cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* Versions — — ·open-webui

Remediation

Upgrade open-webui to version 0.11.4, which is the fixed version for this range.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA open-webui (open-webui) Fixed in 0.11.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-12
open-webui 0.11.4
19 records Highest priority Priority HIGH 3 HIGH, 8 MEDIUM, 8 LOW
Other records, highest priority first
- TI-2026-71106 Stored cross-site scripting in Open WebUI via DOCX previewPriority HIGH 72
- TI-2026-71108 Session cookie disclosure in Open WebUI OAuth-mode connectionsPriority HIGH 68
- TI-2026-71104 Stored cross-site scripting in Open WebUI markdown linksPriority HIGH 67
Show all 19 records →

Timeline

2026-10-12 Threatist record created from CVE-2026-109298
2026-10-12 Alias added: GHSA-x55j-pj79-2cgm
2026-10-13 CISA SSVC decision points changed
2026-10-24 Weakness changed · CNA

References

Patch 1

Patch Commit

Advisory 1

GitHub Security Advisory (GHSA-gww9-mhgj-pfqh)

TI-2024-06216 Open WebUI Arbitrary File Upload + Path Traversal CVSS 3.1HIGH 8.8
TI-2024-07467 Improper Authentication in open-webui/open-webui CVSS 3.1HIGH 8.2
TI-2026-42359 Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id CVSS 3.1CRITICAL 9.0
TI-2026-40759 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation CVSS 4.0CRITICAL 9.0
TI-2024-07431 Cross-site Scripting (XSS) in open-webui/open-webui CVSS 3.0CRITICAL 9.0
TI-2026-60021 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin CVSS 3.1HIGH 8.7

See all 175 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences