Vulnerability Details CVE-2026-34783
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 38.1%
CVSS Severity
CVSS v3 Score 8.1
References
Products affected by CVE-2026-34783
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cpe:2.3:a:montferret:ferret:*
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cpe:2.3:a:montferret:ferret:2.0.0