Medium severity · published Oct 12, 2026
CVE-2026-109294
Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
0.6.42 before 0.11.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109294
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109294
vendor-advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-w8j8-jv6j-3m47
third-party-advisory
https://www.vulncheck.com/advisories/open-webui-0.6.42-before-0.11.4-memory-exhaustion-via-compressed-remote-image
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