CVE-2025-59956

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.

The following products are affected by CVE-2025-59956 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-59956.

URL	Resource
https://github.blog/security/application-security/localhost-dangers-cors-and-dns-rebinding
https://github.com/coder/agentapi/commit/5c425c62447b8a9eac19e9fc5a2eae7f0803f149
https://github.com/coder/agentapi/pull/49
https://github.com/coder/agentapi/releases/tag/v0.4.0
https://github.com/coder/agentapi/security/advisories/GHSA-w64r-2g3w-w8w4
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration
https://mcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration/