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CVE-2025-59956

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Date: September 29, 2025

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.

Severity Score

Related Resources (10)

https://github.com/coder/agentapi
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration
https://github.blog/security/application-security/localhost-dangers-cors-and-dns-rebinding
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration/
https://nvd.nist.gov/vuln/detail/CVE-2025-59956
https://github.com/coder/agentapi/pull/49
https://github.com/coder/agentapi/commit/5c425c62447b8a9eac19e9fc5a2eae7f0803f149
https://github.com/coder/agentapi/releases/tag/v0.4.0
https://github.com/coder/agentapi/security/advisories/GHSA-w64r-2g3w-w8w4
https://www.mend.io/vulnerability-database/CVE-2025-59956

Severity Score

Weakness Type (CWE)

Reliance on Reverse DNS Resolution for a Security-Critical Action

CWE-350

Top Fix

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Upgrade Version

Upgrade to version github.com/coder/agentapi - v0.4.0;github.com/coder/agentapi - v0.4.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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