| Title | a2ui-project a2ui V1.0 CWE-918 |
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| Description | The FileResolver is designed with security configuration options (allowed_hosts, allowed_mime_types, magic-byte verification, size and concurrency limits). However, allowed_hosts=None is the default, and in that mode the resolver performs an httpx GET on any http(s) URL supplied via the client-controlled fileId (or an LLM-initiated tool call), following redirects. The redirect-host check only runs when an allowlist is configured, and the connection is already made before any check — leaving a blind-request window and a DNS-rebinding TOCTOU (validation and connection resolve the hostname independently). |
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| Source | ⚠️ https://github.com/a2ui-project/a2ui/issues/2295 |
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| User | colorfullbz (UID 86308) |
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| Submission | 08/17/2026 15:29 (30 days ago) |
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| Moderation | 09/15/2026 20:29 (29 days later) |
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| Status | Accepted |
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| VulDB entry | 404460 [a2ui-project a2ui up to 0.10.7 FileResolver file_resolver.py httpx.get server-side request forgery] |
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| Points | 20 |
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