This advisory follows the security advisory GHSA-79w7-vh3h-8g4j published by the yt-dlp/yt-dlp project to aid remediation of the issue in the ytdl-org/youtube-dl project.
youtube-dl does not limit the extensions of downloaded files, which could lead to arbitrary filenames being created in the download folder (and path traversal on Windows).
Since youtube-dl also reads config from the working directory (and, on Windows, executables will be executed from the youtube-dl directory by default) the vulnerability could allow the unwanted execution of local code, including downloads masquerading as, eg, subtitles.
The versions of youtube-dl listed as Patched remediate this vulnerability by disallowing path separators and whitelisting allowed extensions. As a result, some very uncommon extensions might not get downloaded.
Any/all of the below considerations may limit exposure in case it is necessary to use a vulnerable version
.%(ext)s at the end of the output templatePATH or other sensitive locations, such as your user directory or system directoriesNoDefaultCurrentDirectoryInExePath to prevent the cmd shell's executable search adding the default directory before PATHnon_existent_dir\..\..\target does not exist in Linux or macOS--get-filename)--write-subs/ --write-srt, --write-auto-subs/--write-automatic-subs, --all-subs).| Software | From | Fixed in |
|---|---|---|
youtube-dl
|
2015.01.25 | 2021.12.17.x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.