PT-2026-42909 · Prefect · Prefect-Github

Published 2026-05-24 · Updated 2026-05-26 · CVE-2026-3515

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Prefect version 3.6.18

Description An issue in the GitHubRepository block of the prefect-github integration allows the injection of arbitrary git command-line options through the reference field. This occurs because the reference field is concatenated directly into a git clone command string without proper sanitization before being parsed by shlex.split(). This can lead to Server-Side Request Forgery (SSRF), credential theft, or remote code execution (RCE) by injecting options such as -c. The affected functions are aget directory() and get directory() located in src/integrations/prefect-github/prefect github/repository.py.

Recommendations For version 3.6.18, restrict the use of the reference field in the GitHubRepository block until a fix is applied.

Fix

RCE

Argument Injection

Weakness Enumeration

CWE-88

Related Identifiers

CVE-2026-3515

GHSA-CW25-2P92-7F75

Affected Products

Prefect-Github

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-3515 · Security Note
• https://osv.dev/vulnerability/GHSA-cw25-2p92-7f75 · Vendor Advisory
• https://github.com/PrefectHQ/prefect · Note
• https://huntr.com/bounties/f3b048b8-7f4e-45ef-a5a7-cb841c39acde · Note
• https://twitter.com/CVEnew/status/2058530621253914949 · Twitter Post
• https://t.me/CVEtracker/54748 · Telegram Post