How severe is CVE-2026-45109?

CVE-2026-45109 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-2026-45109 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-2026-45109?

CVE-2026-45109 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45109?

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-2026-45109 have an EU (EUVD) identifier?

Yes. CVE-2026-45109 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30085.

When was CVE-2026-45109 published?

CVE-2026-45109 was published on 2026-05-13 and last updated on 2026-07-03.

CVE-2026-45109

CVE-2026-45109 is a high-severity vulnerability in Vercel Next.js 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-288.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30085
Weakness: CWE-288
Affected product: Vercel Next.js
Published: 2026-05-13
Last modified: 2026-07-03

Description

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

Frequently asked questions

What is CVE-2026-45109?: Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.
How severe is CVE-2026-45109?: CVE-2026-45109 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-2026-45109 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-2026-45109?: CVE-2026-45109 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45109?: 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-2026-45109 have an EU (EUVD) identifier?: Yes. CVE-2026-45109 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30085.
When was CVE-2026-45109 published?: CVE-2026-45109 was published on 2026-05-13 and last updated on 2026-07-03.

References

Affected products (1)

cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

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