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Vulnerability record · CVE-2026-3515 · published 24 May 2026

CVE-2026-3515: Argument injection vulnerability

A vulnerability in the `GitHubRepository` block of the `prefect-github` integration in Prefect version 3.6.18 allows an attacker to inject arbitrary git command-line options via the `reference` field. The `reference` field is concatenated directly into a `git clone` command string without proper sanitization, and then parsed by `shlex.split()`. This enables injection of options such as `-c`, leading to potential Server-Side Request Forgery (SSRF), credential theft, or remote code execution (RCE). The vulnerability affects both the `aget_directory()` and `get_directory()` methods in `src/integrations/prefect-github/prefect_github/repository.py`. This issue does not affect the GitLab and BitBucket integrations, which use a safer list-based command construction approach.

8.5 CVSS 3.0 High EPSS 0.48% · top 61.2% CWE-88 · Argument injection Awaiting Analysis
8.5CVSS 3.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
23 Jul 2026Last modified by NVD

Description

A vulnerability in the `GitHubRepository` block of the `prefect-github` integration in Prefect version 3.6.18 allows an attacker to inject arbitrary git command-line options via the `reference` field. The `reference` field is concatenated directly into a `git clone` command string without proper sanitization, and then parsed by `shlex.split()`. This enables injection of options such as `-c`, leading to potential Server-Side Request Forgery (SSRF), credential theft, or remote code execution (RCE). The vulnerability affects both the `aget_directory()` and `get_directory()` methods in `src/integrations/prefect-github/prefect_github/repository.py`. This issue does not affect the GitLab and BitBucket integrations, which use a safer list-based command construction approach.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

References

LinkTags
https://huntr.com/bounties/f3b048b8-7f4e-45ef-a5a7-cb841c39acde

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Source: NIST National Vulnerability Database (record CVE-2026-3515), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.