CVE-2026-96620

Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution

En bref

Sévérité: CRITICAL 9.2
EPSS: EPSS 0.70 % · centile 53 (2026-10-27)
État: PUBLISHED
Publiée: 2026-10-16
Mise à jour: 2026-10-21
Attribuée par: GitHub_M
Statut NVD: Awaiting Analysis

Description

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 4.0	CRITICAL 9.2	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M
CVSS 4.0	CRITICAL 9.2	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · security-advisories@github.com (Secondary)

Faiblesses (CWE)

Avis

GHSA-h4mw-j7qp-8mwm — Claude Agent SDK: Argument Injection via resume Option Allows Arbitrary Command Execution

Références européennes

ENISA EUVD · EUVD-2026-103155
GCVE · GCVE-0-2026-96620

Produits affectés

Produit	Versions
anthropics · claude-agent-sdk-python	affected < 0.2.121

Références

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD