{
  "schemaVersion": 1,
  "incident": {
    "id": "cve-2026-96620",
    "url": "https://cveboard.org/i/cve-2026-96620",
    "urlPt": "https://cveboard.org/pt/i/cve-2026-96620",
    "json": "https://cveboard.org/i/cve-2026-96620.json",
    "kind": "vuln",
    "live": true,
    "knownExploited": false,
    "severity": "critical",
    "title": "Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution",
    "summary": "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.",
    "titlePt": "Claude Agent SDK: Injeção de argumento via opção resume permite execução arbitrária de comandos",
    "summaryPt": "O SDK do Claude Agent para Python passou a opção resume para o CLI do Claude sem validação, permitindo que um valor iniciado com - fosse interpretado como uma flag CLI separada. Um atacante que controlasse o valor do resume poderia injetar uma flag --mcp-config definindo um servidor MCP stdio, resultando na execução arbitrária de comandos no início do CLI que contornava os controles de permissão do SDK.",
    "cves": [
      "CVE-2026-96620"
    ],
    "ghsa": "GHSA-h4mw-j7qp-8mwm",
    "cvss": {
      "score": 9.2,
      "version": "4.0"
    },
    "epss": {
      "percentage": 0.00578,
      "percentile": 0.46547,
      "asOf": "2026-10-23"
    },
    "packages": [
      {
        "ecosystem": "pip",
        "name": "claude-agent-sdk",
        "vulnerable": "< 0.2.121",
        "fixed": "0.2.121",
        "advisory": "GHSA-h4mw-j7qp-8mwm"
      }
    ],
    "vendor": null,
    "product": null,
    "kev": null,
    "breach": null,
    "retracted": false,
    "sources": [
      {
        "label": "GitHub Advisory Database",
        "url": "https://github.com/advisories/GHSA-h4mw-j7qp-8mwm"
      }
    ],
    "publishedAt": "2026-10-16T19:44:37.000Z",
    "updatedAt": "2026-10-16T19:44:37.000Z"
  },
  "live": true,
  "events": [
    {
      "id": "ghsa:GHSA-h4mw-j7qp-8mwm:ghsa_published:2026-10-16T19:44:37.000Z",
      "incidentId": "cve-2026-96620",
      "type": "ghsa_published",
      "at": "2026-10-16T19:44:37.000Z",
      "detail": {
        "ghsa": "GHSA-h4mw-j7qp-8mwm",
        "severity": "critical",
        "fixed": "0.2.121"
      }
    }
  ]
}