What is CVE-2026-109294?

CVE-2026-109294 is a medium-severity vulnerability in Open-Webui, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-12.

How severe is CVE-2026-109294?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Open-Webui

CVE-2026-109294

Open WebUI from 0.6.42 before 0.11.4 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory by supplying compressed remote image URLs in chat messages. Attackers can point the image field at a host returning gzip-encoded responses, which get_image_base64_from_url decompresses unbounded, causing denial of service for all users.

Vulnerability class: DoS (Denial of Service)

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Open-Webui

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/open-webui/open-webui/security/advisories/GHSA-w8j8-jv6j-3m47 (vendor-advisory)
www.vulncheck.com/advisories/open-webui-0.6.42-before-0.11.4-memory-exhaustion-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109294?: CVE-2026-109294 is a medium-severity vulnerability in Open-Webui, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-10-12.
How severe is CVE-2026-109294?: Medium severity. CVSS v3 base score is 6.5 out of 10.