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CVE-2026-109295— Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop

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 版本 0.11.0 至 0.11.4（不含 0.11.4）存在正则表达式拒绝服务（ReDoS）漏洞。攻击者可利用文件搜索模式，通过触发灾难性回溯的正则表达式，使经过身份验证的用户导致服务器工作进程停滞。具体而言，攻击者可诱导模型调用 或 函数，该函数每次被重复调用时会阻塞事件循环长达两秒，从而严重影响服务性能与可用性。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
open-webui open-webui 0.11.0< 0.11.4 affected
0.11.4 unaffected
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I. Basic Information for CVE-2026-109295

Vulnerability Information
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Vulnerability Title
Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.
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
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui 0.11.0 ~ 0.11.4 -

II. Public POCs for CVE-2026-109295

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III. Intelligence Information for CVE-2026-109295

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Vendor Advisories for CVE-2026-109295 (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-2026-109290 7.3 HIGH Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview
CVE-2026-109291 7.3 HIGH Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url
CVE-2026-109292 6.8 MEDIUM Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections
CVE-2026-109299 6.5 MEDIUM Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
CVE-2026-109298 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex
CVE-2026-109297 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules
CVE-2026-109293 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint
CVE-2026-109294 6.5 MEDIUM Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
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-2026-109296 4.3 MEDIUM Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
CVE-2026-109287 4.3 MEDIUM Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID
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-1333

V. Comments for CVE-2026-109295

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