How severe is CVE-2026-44576?

CVE-2026-44576 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-44576 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44576?

CVE-2026-44576 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44576?

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

Does CVE-2026-44576 have an EU (EUVD) identifier?

Yes. CVE-2026-44576 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30060.

When was CVE-2026-44576 published?

CVE-2026-44576 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44576

CVE-2026-44576 is a medium-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 5.4. 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-436.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30060
Weakness: CWE-436
Affected product: Vercel Next.js
Published: 2026-05-13
Last modified: 2026-06-17

Description

Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the expected HTML. This vulnerability is fixed in 15.5.16 and 16.2.5.

Frequently asked questions

What is CVE-2026-44576?: Next.js is a React framework for building full-stack web applications. From 14.2.0 to before 15.5.16 and 16.2.5, applications using React Server Components can be vulnerable to cache poisoning when shared caches do not correctly partition response variants. Under affected conditions, an attacker can cause an RSC response to be served from the original URL and poison shared cache entries so later visitors receive component payloads instead of the expected HTML. This vulnerability is fixed in 15.5.16 and 16.2.5.
How severe is CVE-2026-44576?: CVE-2026-44576 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-44576 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44576?: CVE-2026-44576 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44576?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44576 have an EU (EUVD) identifier?: Yes. CVE-2026-44576 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30060.
When was CVE-2026-44576 published?: CVE-2026-44576 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/vercel/next.js/security/advisories/GHSA-wfc6-r584-vfw7

Affected products (1)

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

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