Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L L N C H H H 9.9 .0087 56.1 —
AFFECTED Product Versions Fixed prefecthq/prefect unspecified – —
TIMELINE Apr 1 Reserved by @huntr_ai Jun 20 EXPLOIT PUBLISHED — CVE-2026-5366 (prefecthq/prefect). Public exploit reference added. Jun 20 Published (CNA: @huntr_ai)
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.
| Date | Event | Detail |
|---|---|---|
| April 1, 2026 | Reserved | Reserved by @huntr_ai |
| June 20, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-5366 (prefecthq/prefect). Public exploit reference added. |
| June 20, 2026 | Published | Published (CNA: @huntr_ai) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| prefecthq | prefecthq/prefect | — | unspecified | — |
Authoritative record: CVE-2026-5366 at cve.org
Vendors: prefecthq
Weaknesses: CWE-94
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-5366 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.