CVE-2026-5366Public exploitNetwork attack vector

Authenticated code execution via Git argument injection

Published Jun 20, 2026 · Updated Jun 20, 2026

Argument injection in Prefect 3.6.23 allows remote authenticated users to execute arbitrary commands on worker machines. GitRepository passes user-controlled commit_sha and directories values to git without validation or end-of-options separation, allowing flags such as --upload-pack to invoke external programs. Deployment-creation permission is required, and successful exploitation compromises workers that service shared work pools.

CVSS severity9.9
Critical
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Prefect 3.6.23 allows remote authenticated users to execute arbitrary commands on worker machines. GitRepository passes user-controlled commit_sha and directories values to git without validation or end-of-options separation, allowing flags such as --upload-pack to invoke external programs. Deployment-creation permission is required, and successful exploitation compromises workers that service shared work pools.

The record

CVE
CVE-2026-5366
Published
Jun 20, 2026
Updated
Jun 20, 2026
Vendor
Prefect Technologies, Inc.
Product
Prefect
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Prefect Technologies, Inc. · Prefectversion=unspecified <=latest

Published CVSS scores

9.9huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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