Ethical Hacking News
NGINX CVE-2026-42945, a recently disclosed security flaw affecting NGINX Plus and NGINX Open, has emerged as a pressing concern in the realm of web server security. The vulnerability can be exploited to crash worker processes or execute remote code with crafted HTTP requests.
NGINX CVE-2026-42945 is a heap buffer overflow vulnerability affecting NGINX Plus and NGINX Open, impacting versions 0.6.27 through 1.30.0.The vulnerability can be exploited to crash worker processes or execute remote code with crafted HTTP requests.Code execution requires Address Space Layout Randomization (ASLR) to be turned off.The exploitation of this flaw is possible only on devices where ASLR has been disabled.Users are urged to apply the latest fixes from F5 to secure their networks against active threats.This vulnerability is one of several critical flaws discovered in various web server applications.
NGINX CVE-2026-42945, a recently disclosed security flaw affecting NGINX Plus and NGINX Open, has emerged as a pressing concern in the realm of web server security. The vulnerability, tracked as CVE-2026-42945 (CVSS score: 9.2), is attributed to a heap buffer overflow in ngx_http_rewrite_module, impacting NGINX versions ranging from 0.6.27 through 1.30.0.
According to AI-native security company depthfirst, the vulnerability was introduced in 2008, underscoring its long-standing nature and the potential for widespread exploitation. The successful exploitation of this flaw can permit an unauthenticated attacker to crash worker processes or execute remote code with crafted HTTP requests. However, it is essential to note that code execution is possible only on devices where Address Space Layout Randomization (ASLR), a safeguard against memory-based attacks, is turned off.
"It relies on a specific NGINX config to be vulnerable, and for an attacker to know or discover the config to exploit it," stated security researcher Kevin Beaumont. "To reach RCE [remote code execution], also ASLR needs to have been disabled on the box."
Similarly, AlmaLinux maintainers cautioned that turning the heap overflow into reliable code execution is not trivial in the default configuration, and on systems with ASLR enabled (which is the default on every supported AlmaLinux release), they do not expect a generic, reliable exploit to be easy to produce. Nevertheless, they emphasized that "not easy" does not equate to "impossible," and therefore, users are urged to apply the latest fixes from F5 to secure their networks against active threats.
This vulnerability is just one of several critical flaws discovered in various web server applications, with another notable example being the exploitation of two vulnerabilities in openDCIM. These vulnerabilities, both rated 9.3 on the CVSS scoring system, include:
1. CVE-2026-28515 - A missing authorization vulnerability that could allow an authenticated user to access LDAP configuration functionality regardless of their assigned privileges.
2. CVE-2026-28517 - An operating system command injection vulnerability impacting the "report_network_map.php" component that processes a parameter called "dot" without sanitization and passes it directly to a shell command, resulting in arbitrary code execution.
Both of these vulnerabilities were discovered by VulnCheck security researcher Valentin Lobstein in February 2026. Alongside CVE-2026-28516 (CVSS score: 9.3), an SQL injection vulnerability in openDCIM, the three flaws can be chained to achieve remote code execution over five HTTP requests and spawn a reverse shell.
The cluster of attacker activity observed so far originates from a single Chinese IP and utilizes what appears to be a customized implementation of AI vuln discovery tool Vulnhuntr to automatically check for vulnerable installations before dropping a PHP web shell. Caitlin Condon, vice president of security research at VulnCheck, commented on the situation: "The cluster of attacker activity we're observing so far originates from a single Chinese IP and uses what appears to be a customized implementation of AI vuln discovery tool Vulnhuntr to automatically check for vulnerable installations before dropping a PHP web shell."
As the threat landscape continues to evolve at an unprecedented pace, it is essential that users remain vigilant and proactive in addressing potential vulnerabilities. This includes ensuring timely updates and patches are applied to prevent exploitation, as well as adhering to best practices for web server security.
In conclusion, NGINX CVE-2026-42945 serves as a poignant reminder of the ever-present risks associated with unpatched vulnerabilities in widely used software applications. It is imperative that users and organizations take immediate action to address this vulnerability and any others that may be present in their systems.
NGINX CVE-2026-42945, a recently disclosed security flaw affecting NGINX Plus and NGINX Open, has emerged as a pressing concern in the realm of web server security. The vulnerability can be exploited to crash worker processes or execute remote code with crafted HTTP requests.
Related Information:
https://www.ethicalhackingnews.com/articles/NGINX-CVE-2026-42945-A-Growing-Concern-for-Web-Server-Security-ehn.shtml
https://thehackernews.com/2026/05/nginx-cve-2026-42945-exploited-in-wild.html
Published: Sun May 17 10:47:40 2026 by llama3.2 3B Q4_K_M
