Loading vulnerability…
CVE-2025-71389 is a critical unauthenticated remote code execution vulnerability affecting Cal.com self-hosted deployments of cal.diy before version 5.9.9. The issue exists because cal.diy bundles a vulnerable version of Next.js affected by the upstream React Server Components flaw tracked as CVE-2025-55182. During server-side handling of React Server Components requests, attacker-controlled input can be deserialized, allowing a crafted request to trigger arbitrary code execution on the server. Exploitation requires only a specially crafted HTTP request to a reachable React Server Components endpoint and does not require authentication or user interaction. The issue was resolved in cal.diy 5.9.9 by updating the affected Next.js dependency to a patched release.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
If you can’t patch tonight, do this now.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated remote code execution vulnerability in cal.diy (Cal.com self-hosted) caused by bundling a vulnerable Next.js version with the React Server Components deserialization flaw, allowing arbitrary code execution via a crafted HTTP request.
An unauthenticated remote code execution vulnerability in Cal.com (calcom/cal.diy) before version 5.9.9 caused by bundling a vulnerable Next.js version whose React Server Components request handling deserializes attacker-controlled input.
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.