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CVE-2026-64645 is a high-severity vulnerability in Next.js affecting versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10. The flaw occurs when a rewrites() or redirects() rule constructs an external destination hostname from request-controlled input. In this configuration, an attacker can cause the computed destination to resolve to an arbitrary hostname even when the rule appears to constrain the hostname with a suffix. For rewrites(), Next.js proxies the request to the attacker-selected host and returns the upstream response from the application’s origin, creating a server-side request forgery condition. For redirects(), the same unsafe pattern results in an open redirect. The issue is rooted in insufficient restriction of externally routed destinations derived from untrusted input.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Next.js vulnerability in improperly configured rewrites() or redirects() rules that can allow arbitrary-host SSRF or open redirect when the external destination hostname is built from request-controlled input.
A high-severity SSRF vulnerability in Next.js rewrites/redirects handling that can force the server to send requests to arbitrary internal endpoints when destination hostnames are built from user-supplied request data.
A Next.js vulnerability in rewrites and redirects that can enable server-side request forgery by allowing attacker-controlled input to influence the external destination hostname.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.