CVE-2026-7574CWE-353

Anthropic Claude Desktop Cowork VM Image Contents Not Validated Before Use

High · published June 23, 2026

CVSS v3.1
8.7
EPSS
0%
Percentile
1.5
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v3.1
8.7 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00115 · 1.5th percentile
Weakness
CWE-353 · Missing Support for Integrity Check
Published
2026-06-23T23:54Z
EPSS history
Timeline
  • 23 JUN 23:54Z
    Anthropic Claude Desktop Cowork VM Image Contents Not Validated Before Use
    cvelistv5