Reversible One-Way Hash in Next.js - CVE-2026-44582
Published: May 6, 2026
Vulnerability identifier: #VU130274
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44582
CWE-ID: CWE-328
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to poison shared cache entries and cause users to receive the wrong response variant for a given URL.
The vulnerability exists due to use of a weak hash in the React Server Component cache-busting mechanism when generating the _rsc cache-busting value for shared caches with insufficient response partitioning. A remote attacker can trigger collisions in crafted requests to poison shared cache entries and cause users to receive the wrong response variant for a given URL.
Only deployments that rely on shared caches with insufficient response partitioning are vulnerable.
Affected software
Next.js
How to mitigate CVE-2026-44582
Install security update from vendor's website.
Next.js - addressed in versions 15.5.16, 16.2.5