How severe is CVE-2026-39859?

CVE-2026-39859 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-39859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39859?

CVE-2026-39859 affects Liquidjs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39859?

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-2026-39859 have an EU (EUVD) identifier?

Yes. CVE-2026-39859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20611.

When was CVE-2026-39859 published?

CVE-2026-39859 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39859

CVE-2026-39859 is a high-severity vulnerability in Liquidjs with a CVSS 3.x base score of 7.5. 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 7.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20611
Weakness: CWE-22
Affected product: Liquidjs
Published: 2026-04-08
Last modified: 2026-06-17

Description

LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.3, liquidjs 10.25.0 documents root as constraining filenames passed to renderFile() and parseFile(), but top-level file loads do not enforce that boundary. A Liquid instance configured with an empty temporary directory as root can return the contents of arbitrary files. This vulnerability is fixed in 10.25.3.

Frequently asked questions

What is CVE-2026-39859?: LiquidJS is a Shopify / GitHub Pages compatible template engine in pure JavaScript. Prior to 10.25.3, liquidjs 10.25.0 documents root as constraining filenames passed to renderFile() and parseFile(), but top-level file loads do not enforce that boundary. A Liquid instance configured with an empty temporary directory as root can return the contents of arbitrary files. This vulnerability is fixed in 10.25.3.
How severe is CVE-2026-39859?: CVE-2026-39859 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-39859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39859?: CVE-2026-39859 affects Liquidjs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39859?: 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-2026-39859 have an EU (EUVD) identifier?: Yes. CVE-2026-39859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20611.
When was CVE-2026-39859 published?: CVE-2026-39859 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/harttle/liquidjs/security/advisories/GHSA-v273-448j-v4qj

Affected products (1)

cpe:2.3:a:liquidjs:liquidjs:*:*:*:*:*:node.js:*:*

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