vulnerability · Fri 16 Oct 2026 · 19:44 UTC
GHSA-h4mw-j7qp-8mwm: Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution
Filed UTCSource GTH ↗
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. …
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9.2
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-96620 | — | — | NVD ↗ |
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