Vulnerability in Vercel Next.js
CVE-2026-44582
Next.js is a React framework for building full-stack web applications. From 13.4.6 to before 15.5.16 and 16.2.5, React Server Component responses can be vulnerable to cache poisoning in deployments that rely on shared caches with insufficient response partitioning. In affected conditions, collisions in the _rsc cache-busting value can allow an attacker to poison cache entries so users receive the wrong response variant for a given URL. This vulnerability is fixed in 15.5.16 and 16.2.5.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Vercel Next.js — versions >= 13.4.6, < 15.5.16, >= 16.0.0, < 16.2.5
Weakness classification (CWE)
References
- github.com/vercel/next.js/security/advisories/GHSA-vfv6-92ff-j949 (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44582?
- CVE-2026-44582 is a low-severity vulnerability in Vercel Next.js, classified under Use of Weak Hash. CVSS score: 3.7/10. Published 2026-05-13.
- How severe is CVE-2026-44582?
- Low severity. CVSS v3 base score is 3.7 out of 10.