What is CVE-2026-40068?

CVE-2026-40068 is a high-severity vulnerability in Anthropic Claude_code, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-05-05.

How severe is CVE-2026-40068?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Anthropic Claude_code

CVE-2026-40068

In versions 2.1.63 through 2.1.83 of Claude Code, the folder trust determination logic used the git worktree commondir file without validating its contents. An attacker could craft a malicious repository with a commondir file pointing to a…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (31.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Anthropic Claude_code
Anthropics Claude-code — versions >= 2.1.63, < 2.1.84

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40068?: CVE-2026-40068 is a high-severity vulnerability in Anthropic Claude_code, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-05-05.
How severe is CVE-2026-40068?: High severity. CVSS v3 base score is 8.8 out of 10.