How severe is CVE-2026-44577?

CVE-2026-44577 has a CVSS 3.x base score of 5.9, 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 none, and availability high.

Is CVE-2026-44577 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44577?

CVE-2026-44577 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44577?

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

Does CVE-2026-44577 have an EU (EUVD) identifier?

Yes. CVE-2026-44577 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30061.

When was CVE-2026-44577 published?

CVE-2026-44577 was published on 2026-05-13 and last updated on 2026-07-03.

CVE-2026-44577

CVE-2026-44577 is a medium-severity vulnerability in Vercel Next.js with a CVSS 3.x base score of 5.9. 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30061
Weakness: CWE-770
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 10.0.0 to before 15.5.16 and 16.2.5, when self-hosting Next.js with the default image loader, the Image Optimization API fetches local images entirely into memory without enforcing a maximum size limit. An attacker could cause out-of-memory conditions by requesting large local assets from the /_next/image endpoint that match the images.localPatterns configuration (by default, all patterns are allowed). This vulnerability is fixed in 15.5.16 and 16.2.5.

Frequently asked questions

What is CVE-2026-44577?: Next.js is a React framework for building full-stack web applications. From 10.0.0 to before 15.5.16 and 16.2.5, when self-hosting Next.js with the default image loader, the Image Optimization API fetches local images entirely into memory without enforcing a maximum size limit. An attacker could cause out-of-memory conditions by requesting large local assets from the /_next/image endpoint that match the images.localPatterns configuration (by default, all patterns are allowed). This vulnerability is fixed in 15.5.16 and 16.2.5.
How severe is CVE-2026-44577?: CVE-2026-44577 has a CVSS 3.x base score of 5.9, 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 none, and availability high.
Is CVE-2026-44577 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44577?: CVE-2026-44577 affects Vercel Next.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44577?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44577 have an EU (EUVD) identifier?: Yes. CVE-2026-44577 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30061.
When was CVE-2026-44577 published?: CVE-2026-44577 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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