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.
History

Tue, 30 Sep 2025 15:15:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 30 Sep 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Coder
Coder agentapi
Vendors & Products Coder
Coder agentapi

Tue, 30 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
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.
Title AgentAPI exposed user chat history via a DNS rebinding attack
Weaknesses CWE-350
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-09-30T14:14:53.214Z

Reserved: 2025-09-23T14:33:49.506Z

Link: CVE-2025-59956

cve-icon Vulnrichment

Updated: 2025-09-30T14:14:47.754Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-30T11:37:41.743

Modified: 2025-10-02T19:12:42.843

Link: CVE-2025-59956

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-09-30T08:47:29Z