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Vulnerability record · CVE-2026-34783 · published 6 April 2026

CVE-2026-34783: Montferret ferret path traversal vulnerability

MMontferret · Ferret

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.

8.1 CVSS 3.1 High EPSS 0.71% · top 48.2% CWE-22 · Path traversalCWE-73 · CWE-73
8.1CVSS 3.1 base score
0.71%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/MontFerret/ferret/commit/160ebad6bd50f153453e120f6d909f5b83322917 Patch
https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4j ExploitMitigationVendor Advisory
https://github.com/MontFerret/ferret/security/advisories/GHSA-j6v5-g24h-vg4j ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34783), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.