CVE-2025-59956CWE-350

AgentAPI exposed user chat history via a DNS rebinding attack

Medium · published September 29, 2025

CVSS v3.1
6.5
EPSS
0%
Percentile
35.8
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00426 · 35.8th percentile
Weakness
CWE-350 · Reliance on Reverse DNS Resolution for a Security-Critical Action
Published
2025-09-29T23:57Z
EPSS history
Timeline
  • 29 SEP 23:57Z
    AgentAPI exposed user chat history via a DNS rebinding attack
    cvelistv5