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NGINX Web Servers Vulnerable to Heap Buffer Overflow; Patch Recommended
By VELSICURO
23 May 2026
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Internasional

NGINX Web Servers Vulnerable to Heap Buffer Overflow; Patch Recommended

JAKARTA — A critical heap buffer overflow vulnerability has been discovered in the popular NGINX web server software, posing potential security risks to unpatched systems. The flaw resides within the rewrite module (ngx_http_rewrite_module) and can be exploited by unauthenticated remote attackers.

The security loophole stems from a string logic flaw in the rewrite and set directives when processing URIs containing specific characters. This flaw triggers a buffer size calculation error, leading to an out-of-bounds write.

According to security reports, the impact of exploiting this vulnerability varies depending on the system architecture and server compilation configurations. Attackers can leverage the flaw to cause a Denial of Service (DoS) by crashing the NGINX worker process. Furthermore, under specific system conditions, the vulnerability could potentially allow for Remote Code Execution (RCE).

To date, there have been no reports of active exploitation in the wild, and no public Proof of Concept (PoC) exploits are currently available for this vulnerability. NGINX developers have confirmed that the most effective mitigation is upgrading the software to the latest secure version.

System administrators and web infrastructure owners are strongly advised to inspect their NGINX server configurations immediately and apply the available security patches to mitigate potential exploitation risks.

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