CVE-2026-7574
HIGHAnthropic Claude Desktop Cowork VM Image Contents Not Validated Before Use
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-7574. PoCs published by 0xBlackash.
AI-analyzed exploit summary The repository contains a functional proof-of-concept exploit for CVE-2026-7574, demonstrating how to tamper with the `rootfs.img` file of the Anthropic Claude Desktop Cowork VM to achieve persistent code execution inside the VM. The script extracts, modifies, and reinserts the ext4 partition of the VM image, bypassing integrity checks.
Description
Anthropic Claude Desktop Cowork VM image handling (confirmed across v1.1348.0 through v1.2278.0, including v1.1348.0, v1.1617.0, and v1.2278.0) validates only file presence and a version marker string before booting rootfs.img, but does not verify image content integrity at time-of-use. A local attacker with unprivileged code execution as the victim macOS user can modify the VM root filesystem image and have it trusted on subsequent Cowork VM boots, enabling persistent arbitrary code execution in the VM and access to host-mounted directories. The estimated CWE mapping is CWE-353 (Missing Support for Integrity Check).
Exploits (1)
The repository contains a functional proof-of-concept exploit for CVE-2026-7574, demonstrating how to tamper with the `rootfs.img` file of the Anthropic Claude Desktop Cowork VM to achieve persistent code execution inside the VM. The script extracts, modifies, and reinserts the ext4 partition of the VM image, bypassing integrity checks.
References (2)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L