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Nginx Buffer Overflow Vulnerability Allows Attackers to Execute Arbitrary Code – PoC Released

Cybersecurity NewsJuly 28, 20264 min read

A high-severity heap buffer overflow in NGINX Plus and NGINX Open Source can let unauthenticated attackers crash worker processes and, under certain conditions, run arbitrary code. Tracked as CVE-2026-42533, the flaw affects configurations that use regex-based map directives or non-cacheable variables in string expressions, and it is especially dangerous when the Stream module’s ssl_preread feature […] The post Nginx Buffer Overflow Vulnerability Allows Attackers to Execute Arbitrary Code – PoC Released appeared first on Cyber Security News.

A high-severity heap buffer overflow in NGINX Plus and NGINX Open Source can let unauthenticated attackers crash worker processes and, under certain conditions, run arbitrary code. Tracked as CVE-2026-42533, the flaw affects configurations that use regex-based map directives or non-cacheable variables in string expressions, and it is especially dangerous when the Stream module’s ssl_preread feature processes crafted TLS traffic before authentication. According to the analysis shared by Zhenpeng (Leo),…

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