Secuno
ENNL
Book demo

CVE-2026-34783

Montferret Ferret remote code execution

8.1 HIGHPublic exploitEPSS 0.71%
  1. Published6 Apr 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Affected products

Montferret Ferret2.0.0 · < 2.0.0

Remediation

Fixed in
Montferret Ferret≥ 2.0.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-821109.6
IBM DataStage on Cloud Pak for Data 5.4.0.0 could allow a remote authenticated attacker…
CVE-2026-821019.6
IBM DataStage on Cloud Pak for Data 5.4.0.0 could allow a remote authenticated attacker…
CVE-2026-196278.2
IBM Planning Analytics 2.0, and 2.1 could allow a remote attacker to read arbitrary…
CVE-2026-1026278.8
IBM TRIRIGA Application Platform 5.0.0 through 5.0.8 could allow a remote authenticated…
CVE-2026-599768.1
ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick…
CVE-2026-859538.5
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7…

Frequently asked

Is CVE-2026-34783 being actively exploited?

CVE-2026-34783 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.71%.

How severe is CVE-2026-34783?

CVE-2026-34783 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.71% probability of exploitation.

Which products are affected by CVE-2026-34783?

Affected products include Montferret Ferret.

How do I fix CVE-2026-34783?

Upgrade affected software to a fixed version, for example Montferret Ferret 2.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34783 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.