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.

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-25)

CWEs

CWE-22, CWE-73

Published

2026-04-06

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• montferret:ferret

Packages (OSV)

References

• https://github.com/MontFerret/ferret/commit/160ebad6bd50f153453e120f6d909f5b83322917
• https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4j
• https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4j

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