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CVE-2025-59956

6.5 · MEDIUM

AgentAPI is an HTTP API for Claude Code, Goose, Aider, Gemini, Amp, and Codex.

Published Sep 30, 2025CWE-350EPSS 0.43%

Overview

CVE-2025-59956 is a medium-severity vulnerability. It was published on September 30, 2025 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgithub.blog/security/application-security/localhost-dangers-cors-and-dns-rebindingGitHubgithub.com/coder/agentapi/commit/5c425c62447b8a9eac19e9fc5a2eae7f0803f149GitHubgithub.com/coder/agentapi/pull/49GitHubgithub.com/coder/agentapi/releases/tag/v0.4.0GitHubgithub.com/coder/agentapi/security/advisories/GHSA-w64r-2g3w-w8w4Refmcpsec.dev/advisories/2025-09-19-coder-chat-exfiltrationRefmcpsec.dev/advisories/2025-09-19-coder-chat-exfiltration/

How CyberStrike helps

Frequently asked questions

What is CVE-2025-59956?

CVE-2025-59956 is a medium-severity vulnerability. It was published on September 30, 2025 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-59956?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-59956?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-59956?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-59956 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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