How severe is CVE-2025-49005?

CVE-2025-49005 has a CVSS 3.x base score of 3.7, rated low 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 none.

Is CVE-2025-49005 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-49005?

CVE-2025-49005 primarily affects Vercel Next.js. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-49005?

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

Does CVE-2025-49005 have an EU (EUVD) identifier?

Yes. CVE-2025-49005 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19911.

When was CVE-2025-49005 published?

CVE-2025-49005 was published on 2025-07-03 and last updated on 2026-06-17.

CVE-2025-49005

CVE-2025-49005 is a low-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 3.7. 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-444.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19911
Weakness: CWE-444
Affected product: Vercel Next.js
Published: 2025-07-03
Last modified: 2026-06-17

Description

Next.js is a React framework for building full-stack web applications. In Next.js App Router from 15.3.0 to before 15.3.3 and Vercel CLI from 41.4.1 to 42.2.0, a cache poisoning vulnerability was found. The issue allowed page requests for HTML content to return a React Server Component (RSC) payload instead under certain conditions. When deployed to Vercel, this would only impact the browser cache, and would not lead to the CDN being poisoned. When self-hosted and deployed externally, this could lead to cache poisoning if the CDN does not properly distinguish between RSC / HTML in the cache keys. This issue has been resolved in Next.js 15.3.3.

Frequently asked questions

What is CVE-2025-49005?: Next.js is a React framework for building full-stack web applications. In Next.js App Router from 15.3.0 to before 15.3.3 and Vercel CLI from 41.4.1 to 42.2.0, a cache poisoning vulnerability was found. The issue allowed page requests for HTML content to return a React Server Component (RSC) payload instead under certain conditions. When deployed to Vercel, this would only impact the browser cache, and would not lead to the CDN being poisoned. When self-hosted and deployed externally, this could lead to cache poisoning if the CDN does not properly distinguish between RSC / HTML in the cache keys. This issue has been resolved in Next.js 15.3.3.
How severe is CVE-2025-49005?: CVE-2025-49005 has a CVSS 3.x base score of 3.7, rated low 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 none.
Is CVE-2025-49005 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-49005?: CVE-2025-49005 primarily affects Vercel Next.js. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-49005?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-49005 have an EU (EUVD) identifier?: Yes. CVE-2025-49005 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19911.
When was CVE-2025-49005 published?: CVE-2025-49005 was published on 2025-07-03 and last updated on 2026-06-17.

References

Affected products (2)

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

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