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Critical NGINX Heap Buffer Overflow CVE-2026-42533 Enables RCE

🕵️ RESEARCH & DEEP DIVES

  • Critical NGINX Heap Buffer Overflow Vulnerability CVE-2026-42533 Allows Remote Code Execution — The Hacker News
    A critical heap buffer overflow in NGINX can cause crashes and enable remote code execution.
    • Affects NGINX core server, NGINX Plus, Ingress Controller, Gateway Fabric, App Protect WAF, and Instance Manager
    • Vulnerability CVE-2026-42533 exists in nginx versions from 0.9.6 through 1.31.2, patched in 1.30.4 and 1.31.3
    • Heap overflow triggered by crafted HTTP requests exploiting regex-based map configurations with specific capture ordering
    • Attack complexity is high; remote code execution possible if ASLR is disabled or bypassed
    • Reported independently by multiple researchers; fix credited to Mufeed VH and Maxim Dounin

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