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CVE-2026-64643 is an information disclosure vulnerability in Next.js affecting versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10. In affected applications that use App Router together with Server Actions (use server) or use cache endpoints, internal Server Function endpoint identifiers can be exposed to unauthenticated users. The issue arises because Server Action IDs and related endpoint references may be included in publicly served client artifacts, such as static client chunks, allowing attackers to discover identifiers for endpoints that are normally associated with authenticated application flows. The disclosed data is described as opaque internal endpoint identifiers rather than credentials or personal data, but it reveals implementation details about internal server-side callable functionality.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
use cache endpoint identifiers. This is primarily a reconnaissance and information exposure issue rather than direct compromise by itself. However, the disclosure can reduce attacker uncertainty about internal application structure and callable server-side functionality, and may increase the effectiveness of follow-on attacks when combined with other weaknesses affecting authorization, request routing, or server action handling.If you can’t patch tonight, do this now.
use cache endpoints. Enforce authorization checks inside each use server or use cache boundary so that disclosure of endpoint identifiers does not by itself grant access to protected functionality. Review App Router applications for reflective Server Actions and Cache Component usage that could expose internal endpoint references through public client artifacts.Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.