Home/CVE/AgentAPI is an HTTP API for Claude Code, Goose, Aider, Gemini, Amp, and Codex. Versions 0.3.3 and below are susceptible
CVE

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

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.

MEDIUM · CVSS 6.5 EPSS 0.00068
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-290Authentication Bypass by Spoofing
CWE-350Reliance on Reverse DNS Resolution for a Security-Critical Action
▤

Affected Products & Versions

1
coder agentapi< 0.4.0
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Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/coder/agentapi MODERATE fixed in 0.4.0
⚠

Public Exploits & PoCs

2
pocmcpsec.dev · 2025-09-19-coder-chat-exfiltrationmcpsec.dev
pocmcpsec.dev · 2025-09-19-coder-chat-exfiltrationmcpsec.dev
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Sep 2025 · 11:37 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
suse-csafopenSUSE-SU-2025:15666-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.blog/security/application-security/localhost-dangers-cors-and-dns-rebindingTechnical Description
https://github.com/coder/agentapi/commit/5c425c62447b8a9eac19e9fc5a2eae7f0803f149Patch
https://github.com/coder/agentapi/pull/49Issue TrackingPatch
https://github.com/coder/agentapi/releases/tag/v0.4.0Release Notes
https://github.com/coder/agentapi/security/advisories/GHSA-w64r-2g3w-w8w4PatchVendor Advisory
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