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Vulnerability details

CVE-2026-34783

MontFerret ferret

Ferret has a Path Traversal in IO::FS::WRITE allows arbitrary file write when scraping malicious websites

CVSS 3.1
8.1High

Official 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 scores

ScoreVersionSourceVector
8.1High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Affected products

VendorProductVersionsSource
MontFerret ferret < 2.0.0-alpha.4 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-04-06
Last updated
2026-04-07
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.52%
Probability of exploitation in 30 days
44.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-22
    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-73
    External Control of File Name or Path