https://db.gcve.eu/rss/recent/all/10 Most recent entries from all 2026-10-17T13:32:05.595812+00:00 Vulnerability-Lookup info@gcve.eu python-feedgen Contains only the most 10 recent entries. https://db.gcve.eu/vuln/fkie_cve-2026-96620 fkie_cve-2026-96620 2026-10-17T13:32:05.607566+00:00

Claude Agent SDK is a Python SDK for Claude Code. Prior to 0.2.121, the resume option is passed to the Claude CLI as a separate token without validation, so a dash-leading value is parsed as an independent CLI flag. An attacker can inject the --mcp-config flag to define a stdio MCP server, causing arbitrary command execution at CLI startup outside the SDK permission controls. The issue is exploitable when an application passes untrusted input as the session ID to resume. This issue is fixed in version 0.2.121.

 https://db.gcve.eu/vuln/ghsa-h4mw-j7qp-8mwm GHSA-h4mw-j7qp-8mwm — Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution 2026-10-17T13:32:05.607634+00:00

Affected: PyPI: claude-agent-sdk

The Claude Agent SDK for Python passed the `resume` option to the Claude CLI without validation, allowing a value beginning with `-` to be interpreted as a separate CLI flag. An attacker who controlled the `resume` value could inject an `--mcp-config` flag defining a stdio MCP server, resulting in arbitrary command execution at CLI startup that bypassed the SDK's permission controls. Exploitation required an application to pass untrusted input as the session ID to resume.

Users are advised to update to the latest version of the claude-agent-sdk package.

Thank you to hackerone.com/moamenmahmood for reporting this issue.