CVE-2026-109294CWE-400denial-of-service

CVE-2026-109294

Medium · published October 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
22.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00307 · 22.3th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-10-12T21:17Z
References (2)
https://github.com/open-webui/open-webui/security/advisories/GHSA-w8j8-jv6j-3m47 · [email protected]https://www.vulncheck.com/advisories/open-webui-0.6.42-before-0.11.4-memory-exhaustion-via-compressed-remote-image · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
    cvelistv5