GCD AI RADAR
incidents/AIR-2026-0905

Open WebUI server hang vulnerability via cyclic chat message deletion

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerability

An unvalidated JSON structure in chat histories allowed authenticated users to trigger an infinite loop by deleting messages in a cyclic chat tree. This infinite loop blocks server requests until the process is restarted.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerability
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
owasp llm top 10
mitre atlas
no technique for these categories
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Framework / tooling
products
Open WebUI
incident date
9 Sep 2026
first reported
9 Sep 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2026-88000 · dos
record
created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z · json

Sources · 2

  1. 2026-09-09
    CVE-2026-88000: Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree
    GitHub Advisory Database · github.com/advisories/GHSA-3cgp-3cqx-j8w2
  2. 2026-09-09
    CVE-2026-88000: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-88000

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