CVE-2026-109294 Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
Authenticated attackers can cause server-wide denial of service by submitting compressed remote image URLs that trigger unbounded memory consumption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109294?
CVE-2026-109294 is a high-severity denial of service vulnerability in open-webui, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-109294?
How do I fix CVE-2026-109294?
No fix has been published for CVE-2026-109294 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-109294 being exploited?
There is no known exploitation of CVE-2026-109294 in the wild and no public exploit code.
Sources
Also known as GHSA-m9q3-jjxm-j9pj, GHSA-w8j8-jv6j-3m47.