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CVE-2025-49005 is a cache poisoning vulnerability affecting Next.js App Router from 15.3.0 before 15.3.3 and Vercel CLI from 41.4.1 through 42.2.0. Under certain conditions, requests for HTML pages could be served a React Server Component (RSC) payload instead, indicating improper separation of cache entries for different response types. The issue is associated with middleware rewrite key separation and arises when caching infrastructure does not adequately distinguish between RSC and HTML variants in cache keys. In Vercel-hosted deployments, the issue is limited to browser cache behavior and does not poison the CDN cache. In self-hosted or externally deployed environments, the vulnerability can result in cache poisoning when an upstream CDN or caching layer fails to differentiate RSC and HTML responses correctly. The vulnerability was fixed in Next.js 15.3.3.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 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.