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.

• CWE-22
• CWE-73

• https://github.com/MontFerret/ferret/commit/160ebad6bd50f153453e120f6d909f5b83322917Patch
• https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4jExploit, Mitigation, Vendor Advisory
• https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4jExploit, Mitigation, Vendor Advisory

Published

Apr 6, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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