How severe is CVE-2026-39365?

CVE-2026-39365 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-39365 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39365?

CVE-2026-39365 primarily affects Vitejs Vite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-39365?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-39365 have an EU (EUVD) identifier?

Yes. CVE-2026-39365 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19875.

When was CVE-2026-39365 published?

CVE-2026-39365 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39365

CVE-2026-39365 is a medium-severity vulnerability in Vitejs Vite with a CVSS 3.x base score of 5.3. 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: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19875
Weakness: CWE-22
Affected product: Vitejs Vite
Published: 2026-04-07
Last modified: 2026-06-17

Description

Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, the dev server’s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.

Frequently asked questions

What is CVE-2026-39365?: Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, the dev server’s handling of .map requests for optimized dependencies resolves file paths and calls readFile without restricting ../ segments in the URL. As a result, it is possible to bypass the server.fs.strict allow list and retrieve .map files located outside the project root, provided they can be parsed as valid source map JSON. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.
How severe is CVE-2026-39365?: CVE-2026-39365 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-39365 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39365?: CVE-2026-39365 primarily affects Vitejs Vite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-39365?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39365 have an EU (EUVD) identifier?: Yes. CVE-2026-39365 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19875.
When was CVE-2026-39365 published?: CVE-2026-39365 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9

Affected products (2)

cpe:2.3:a:vitejs:vite:*:*:*:*:*:node.js:*:*
cpe:2.3:a:voidzero:vite\+:*:*:*:*:*:node.js:*:*

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