FKIE_CVE-2025-59956
Vulnerability from fkie_nvd - Published: 2025-09-30 11:37 - Updated: 2025-10-08 15:05
Severity ?
Summary
AgentAPI is an HTTP API for Claude Code, Goose, Aider, Gemini, Amp, and Codex. Versions 0.3.3 and below are susceptible to a client-side DNS rebinding attack when hosted over plain HTTP on localhost. An attacker can gain access to the /messages endpoint served by the Agent API. This allows for the unauthorized exfiltration of sensitive user data, specifically local message history, which can include secret keys, file system contents, and intellectual property the user was working on locally. This issue is fixed in version 0.4.0.
References
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"configurations": [
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"descriptions": [
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"lang": "en",
"value": "AgentAPI is an HTTP API for Claude Code, Goose, Aider, Gemini, Amp, and Codex. Versions 0.3.3 and below are susceptible to a client-side DNS rebinding attack when hosted over plain HTTP on localhost. An attacker can gain access to the /messages endpoint served by the Agent API. This allows for the unauthorized exfiltration of sensitive user data, specifically local message history, which can include secret keys, file system contents, and intellectual property the user was working on locally. This issue is fixed in version 0.4.0."
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"value": "AgentAPI es una API HTTP para Claude Code, Goose, Aider, Gemini, Amp y Codex. Las versiones 0.3.3 e inferiores son susceptibles a un ataque de reencuadernaci\u00f3n de DNS del lado del cliente cuando se alojan a trav\u00e9s de HTTP simple en localhost. Un atacante puede obtener acceso al endpoint /messages servido por la API de Agent. Esto permite la exfiltraci\u00f3n no autorizada de datos sensibles del usuario, espec\u00edficamente el historial de mensajes local, que puede incluir claves secretas, contenido del sistema de archivos y propiedad intelectual en la que el usuario estaba trabajando localmente. Este problema est\u00e1 solucionado en la versi\u00f3n 0.4.0."
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],
"id": "CVE-2025-59956",
"lastModified": "2025-10-08T15:05:53.100",
"metrics": {
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"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
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"published": "2025-09-30T11:37:41.743",
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"tags": [
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"url": "https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration"
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"description": [
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"value": "CWE-290"
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"source": "nvd@nist.gov",
"type": "Primary"
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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