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CVE-2025-59956— AgentAPI exposed user chat history via a DNS rebinding attack

Quick assessment

Affected
coder agentapi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AgentAPI是Coder开源的一个接口项目。 AgentAPI 0.3.3及之前版本存在安全漏洞，该漏洞源于容易受到客户端DNS重绑定攻击，可能导致未经授权的敏感用户数据泄露。

CVSS 6.5 · Medium EPSS 0.43% · P35
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I. Basic Information for CVE-2025-59956

Vulnerability Information
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Vulnerability Title
AgentAPI exposed user chat history via a DNS rebinding attack
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当地信任反向DNS
Source: CVE Program / CVE List V5
Vulnerability Title
AgentAPI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AgentAPI是Coder开源的一个接口项目。 AgentAPI 0.3.3及之前版本存在安全漏洞，该漏洞源于容易受到客户端DNS重绑定攻击，可能导致未经授权的敏感用户数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder agentapi < 0.4.0 -

II. Public POCs for CVE-2025-59956

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III. Intelligence Information for CVE-2025-59956

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IV. Related Vulnerabilities

Same vendor: coder
Same weakness: CWE-350

V. Comments for CVE-2025-59956

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