CVE-2026-7574

HIGH 8.7

Anthropic Claude Desktop Cowork VM Image Contents Not Validated Before Use

CVSS Score

8.7

EPSS Score

0.0%

EPSS Percentile

0th

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).

CWE	CWE-353
Vendor	anthropic
Product	claude desktop cowork
Published	Jun 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

Affected Versions

Anthropic / Claude Desktop Cowork

1.1348.0 ≤ 1.2278.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cfp.recon.cx: https://cfp.recon.cx/recon-2026/talk/DZUQYU/ takeonme.org: https://takeonme.org/gcves/GCVE-1337-2026-00000000000000000000000000000000000000000000000001110111111101011111111110000000000000000000000000000000000000000000000000000001010

Credits

Todd Manning todb of AHA!