CVE-2026-5366

Critical · CVSS 9.9

Prefect — Git argument injection RCE (CWE-94 - improper handling of user-controlled input in git commands)

CVSS: 9.9; nvd
EPSS: —
KEV: No
Class: other; CWE-94

Description

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.

Search profile — drives PoC discovery

Symbols GitRepositorycommit_shadirectories--upload-pack--sparse-checkoutgit flags injection

Keywords CVE-2026-5366Prefect GitRepository RCEPrefect commit_sha injectionPrefect git argument injectionPrefect upload-pack exploitPrefect sparse-checkout injectionPrefect 3.6.23 vulnerabilityPrefect worker RCEhuntr Prefect bounty e2e88a0f

Versions: 3.6.23

Ranked PoCs (1) — best first

Heuristic ranking — not yet expert-vetted. Scored on structure + provenance, not execution.

renat0z3r0/prefect-cve-2026-5366 needs review

recent activity

gh_search · Python

★ 0

Recall-favoring discovery; ranking by the Stage-4 scorer (Adam's rubric). Scanner/aggregator repos are hidden.

References

Status: enriched · ingested 2026-07-02T00:00:43.000Z · profiled 2026-07-02T00:30:43.000Z