MontFerret ferret up to 2.0.0-alpha.3 IO::FS::WRITE path traversal

Summaryinfo

A vulnerability was found in MontFerret ferret up to 2.0.0-alpha.3. It has been rated as critical. This impacts the function IO::FS::WRITE. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2026-34783. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in MontFerret ferret up to 2.0.0-alpha.3. It has been classified as critical. This affects the function IO::FS::WRITE. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. The summary by CVE is:

Ferret is a declarative system for working with web data. Prior to 2.0.0-alpha.4, a path traversal vulnerability in Ferret's IO::FS::WRITE standard library function allows a malicious website to write arbitrary files to the filesystem of the machine running Ferret. When an operator scrapes a website that returns filenames containing ../ sequences, and uses those filenames to construct output paths (a standard scraping pattern), the attacker controls both the destination path and the file content. This can lead to remote code execution via cron jobs, SSH authorized_keys, shell profiles, or web shells. This vulnerability is fixed in 2.0.0-alpha.4.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-34783 since 03/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 2.0.0-alpha.4 eliminates this vulnerability.

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Productinfo

Vendor

• MontFerret

Name

• ferret

Version

• 2.0.0-alpha.0
• 2.0.0-alpha.1
• 2.0.0-alpha.2
• 2.0.0-alpha.3

Website

• Product: https://github.com/MontFerret/ferret/

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