What’s Vulnerable › Vulnerabilities

CVE-2026-109294: Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-23
• Weakness: CWE-400

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.

Affected products

• open-webui: from 0.6.42 before 0.11.4 — fixed in 0.11.4

How to fix

Upgrade to a fixed version: open-webui 0.11.4. Check the vendor advisory for mitigations.

References

• https://github.com/open-webui/open-webui/security/advisories/GHSA-w8j8-jv6j-3m47
• https://www.vulncheck.com/advisories/open-webui-0.6.42-before-0.11.4-memory-exhaustion-via-compressed-remote-image

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