Critical · CVSS 9.9CVE-2026-5366GHSA-7PM4-56H2-5RXR

Prefect has Git Flag Injection via commit_sha and directories Parameters Leading to Remote Code Execution (RCE)CVE-2026-5366

Answer in brief

CVE-2026-5366 records a Critical severity (CVSS 9.9) vulnerability in Prefect has Git Flag Injection via commit_sha and directories Parameters Leading to Remote Code Execution (RCE). The current sources do not mark it as known exploited. The current feed maps prefect (pip), prefect (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 20, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Jun 20, 2026Material review Nov 3, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.9
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps prefect (pip), prefect (pypi). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:prefect:prefect:3.6.23:-::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
prefectpip	>=3.1.11,<3.6.25	3.6.25
prefectpypi	>=3.1.11 <3.6.25	3.6.25

Recommended response

Check inventory. Check lockfiles and deployed manifests for prefect, prefect.
Review the reported fix. Update prefect to 3.6.25; prefect to 3.6.25 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 20, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Nov 3, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Jun 20, 2026

Sources and claim methodology

Upstream source description

Prefect versions 3.1.11 through 3.6.24 are 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.

Quoted source text, attributed separately from HOL analysis.

Affected scope and exposure questions

The current feed maps prefect (pip), prefect (pypi). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:prefect:prefect:3.6.23:-::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
prefectpip	>=3.1.11,<3.6.25	3.6.25
prefectpypi	>=3.1.11 <3.6.25	3.6.25

Sources and claim methodology

Upstream source description

Quoted source text, attributed separately from HOL analysis.