CVE-2026-5366

Prefect version 3.6.23 is vulnerable to remote code execution due to improper handling of user-controlled input in the `GitRepository` storage class. The `commit_sha` parameter, which is passed to git commands, lacks validation and does not include a `--` separator to distinguish user input from git flags. This allows attackers to inject arbitrary git flags, such as `--upload-pack`, enabling execution of external programs. Additionally, the `directories` parameter can be exploited to inject git flags during sparse-checkout operations. These vulnerabilities allow any user with deployment creation permissions to execute arbitrary commands on worker machines, compromising shared work pools in multi-tenant environments.

CVSS v3.0

9.9 CRITICALCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

1.03% chance of exploitation in the next 30 days, 61th percentile

Published

2026-06-20

Updated

2026-06-22

Proof-of-concept exploits (1)

• renat0z3r0/prefect-cve-2026-53660★ · 2026-06-27

References

• CVE Record
• NVD entry

Related

• CVE-2026-53655
• CVE-2026-5368
• CVE-2026-53653
• CVE-2026-53694
• CVE-2026-53647
• CVE-2026-5370