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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-59956 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.blog/security/application-security/localhost-dangers-cors-and-dns-rebinding GitHub, Inc.
https://github.com/coder/agentapi/commit/5c425c62447b8a9eac19e9fc5a2eae7f0803f149 GitHub, Inc.
https://github.com/coder/agentapi/pull/49 GitHub, Inc.
https://github.com/coder/agentapi/releases/tag/v0.4.0 GitHub, Inc.
https://github.com/coder/agentapi/security/advisories/GHSA-w64r-2g3w-w8w4 GitHub, Inc.
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration GitHub, Inc.
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration/ CISA-ADP

Weakness Enumeration

CWE-ID CWE Name Source
CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action GitHub, Inc.  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-59956
NVD Published Date:
09/30/2025
NVD Last Modified:
09/30/2025
Source:
GitHub, Inc.