How severe is CVE-2026-34783?

CVE-2026-34783 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-34783 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34783?

CVE-2026-34783 primarily affects Montferret Ferret. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34783?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34783 have an EU (EUVD) identifier?

Yes. CVE-2026-34783 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19353.

When was CVE-2026-34783 published?

CVE-2026-34783 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-34783

CVE-2026-34783 is a high-severity vulnerability in Montferret Ferret with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19353
Weakness: CWE-22
Affected product: Montferret Ferret
Published: 2026-04-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-34783?: CVE-2026-34783 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-34783 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34783?: CVE-2026-34783 primarily affects Montferret Ferret. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34783?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34783 have an EU (EUVD) identifier?: Yes. CVE-2026-34783 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19353.
When was CVE-2026-34783 published?: CVE-2026-34783 was published on 2026-04-06 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:montferret:ferret:*:*:*:*:*:go:*:*
cpe:2.3:a:montferret:ferret:2.0.0:alpha1:*:*:*:go:*:*
cpe:2.3:a:montferret:ferret:2.0.0:alpha2:*:*:*:go:*:*
cpe:2.3:a:montferret:ferret:2.0.0:alpha3:*:*:*:go:*:*

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