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

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI 在 0.6.42 到 0.11.4 版本之间存在一个不受控的资源消耗漏洞。攻击者通过在聊天消息中提供压缩后的远程图片 URL，可以耗尽服务器的内存。具体而言，攻击者可以将图片字段指向一个返回 gzip 编码响应的服务器，而 函数会对这些数据无限制地解压缩，从而导致所有用户的服务拒绝（Denial of Service）。

CVSS 6.5 · Medium EPSS 0.31% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
open-webui open-webui 0.6.42< 0.11.4 affected
0.11.4 unaffected
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I. Basic Information for CVE-2026-109294

Vulnerability Information
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Vulnerability Title
Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui 0.6.42 ~ 0.11.4 -

II. Public POCs for CVE-2026-109294

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III. Intelligence Information for CVE-2026-109294

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Vendor Advisories for CVE-2026-109294 (2)

Same Patch Batch · open-webui · 2026-10-12 · 19 CVEs total

CVE-2026-109286 8.1 HIGH Open WebUI 0.7.0 before 0.11.4 Session Token Theft via SyncStatsModal
CVE-2026-109572 7.6 HIGH Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Terminal Proxy
CVE-2026-109291 7.3 HIGH Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url
CVE-2026-109290 7.3 HIGH Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview
CVE-2026-109292 6.8 MEDIUM Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections
CVE-2026-109297 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules
CVE-2026-109298 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex
CVE-2026-109299 6.5 MEDIUM Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
CVE-2026-109293 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint
CVE-2026-109295 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
CVE-2026-109288 6.4 MEDIUM Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
CVE-2026-109289 6.3 MEDIUM Open WebUI 0.8.8 before 0.11.4 Improper Session Revocation via Terminal WebSocket
CVE-2026-109283 5.4 MEDIUM Open WebUI 0.11.1 before 0.11.4 Authorization Bypass via OAuth Token Exchange
CVE-2026-109285 5.0 MEDIUM Open WebUI 0.6.0 before 0.11.4 Improper Access Control via Stale File Metadata
CVE-2026-109300 4.6 MEDIUM Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
CVE-2026-109287 4.3 MEDIUM Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID
CVE-2026-109296 4.3 MEDIUM Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
CVE-2026-109284 4.3 MEDIUM Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-400

V. Comments for CVE-2026-109294

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