How severe is CVE-2026-44578?

CVE-2026-44578 has a CVSS 3.x base score of 8.6, 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-2026-44578 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 39% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44578?

CVE-2026-44578 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44578?

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-2026-44578 have an EU (EUVD) identifier?

Yes. CVE-2026-44578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30080.

When was CVE-2026-44578 published?

CVE-2026-44578 was published on 2026-05-13 and last updated on 2026-07-03.

CVE-2026-44578

CVE-2026-44578 is a high-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 8.6. Its EPSS exploit-prediction score of 39% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 39% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30080
Weakness: CWE-918
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 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.

Frequently asked questions

What is CVE-2026-44578?: Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.
How severe is CVE-2026-44578?: CVE-2026-44578 has a CVSS 3.x base score of 8.6, 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-2026-44578 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 39% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44578?: CVE-2026-44578 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44578?: 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-2026-44578 have an EU (EUVD) identifier?: Yes. CVE-2026-44578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30080.
When was CVE-2026-44578 published?: CVE-2026-44578 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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