CVE-2026-96620Critical· 9.2▾ MidnightClaude 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 injec…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.6 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 17.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.6%
Last analysed / modified upstream
— → 9.2
0.6% → 0.7%
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.
claude-agent-sdk-python < 0.2.121Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
claude-agent-sdk < 0.2.121Patched in:
claude-agent-sdk 0.2.121Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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