CVE-2026-44582

Next.js: Cache poisoning via collisions in React Server Component cache-busting

State: Published
Severity: 3.7 Low
Published: May 13, 2026
Updated: May 14, 2026
Reserved: May 6, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	3.7 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-328 Use of Weak Hash

Affected Products

Product	Versions
next.jsvercel	>= 13.4.6, < 15.5.16Affected >= 16.0.0, < 16.2.5Affected

References

https://github.com/vercel/next.js/security/advisories/GHSA-vfv6-92ff-j949

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