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CVE-2026-34783: Ferret is a declarative system for working with web data

47
This month
HIGH 8.1UPGRADE

CVE-2026-34783 is a high-severity flaw (CVSS 8.1) affecting ferret. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 contr

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score8.1 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance0.7% (top 47%)
CISA exploited listNo
WeaknessCWE-22, CWE-73
Published2026-04-06
Last modified2026-10-23
Publisher (CNA): GitHub, Inc. · Vendor: montferret

Am I affected?

Timeline

montferret ferret UPGRADE
Affected: < 2.0.0 · 2.0.0 alpha1 · 2.0.0 alpha2 · 2.0.0 alpha3
Fixed in: 2.0.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy ferret || rpm -q ferret || ferret --version
2. UPGRADE to 2.0.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade ferret
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade ferret
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Go · github.com/MontFerret/ferret/v2 · FIXED · 2.0.0-alpha.4 · vulnerable: < 2.0.0-alpha.4 · source
go get github.com/MontFerret/ferret/v2@v2.0.0-alpha.4 go list -m github.com/MontFerret/ferret/v2
Go · github.com/MontFerret/ferret · NO FIX YET · vulnerable: <= 0.18.1 · source
Fedora 46 · python-trimesh · FIXED · 5.2.0-1.fc46 · FEDORA-2026-429b4bad4c · source
sudo dnf upgrade --advisory=FEDORA-2026-429b4bad4c

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34783?

ferret: upgrade to 2.0.0. Exact commands for each OS are on this page.

Is CVE-2026-34783 being exploited?

CVE-2026-34783 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34783 affect?

CVE-2026-34783 affects ferret. Severity is high (CVSS 8.1). 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 th

How urgent is CVE-2026-34783?

Priority 47/100. High severity; Public exploit reference

References

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