Vulnerability · Published Jun 23, 2026 · Assigned by AHA
CVE-2026-7574Anthropic Claude Desktop Cowork VM Image Contents Not Validated Before Use
High 8.7
In plain English
A high-severity security flaw in Claude Desktop Cowork from Anthropic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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).
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Anthropic | Claude Desktop Cowork | 1.1348.0 – through 1.2278.0 |
Weakness: CWE-353 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L