This vulnerability allows remote attackers to execute arbitrary code on affected installations of NGINX. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2026-27654.

F5 fixes critical nginx flaw CVE-2026-42533 that can crash servers and, in some cases, allow remote code execution through crafted HTTP requests. F5 released patches for a critical nginx vulnerability, tracked as CVE-2026-42533 (CVSS score of 9.2), that can allow an unauthenticated attacker to trigger a heap buffer overflow using specially crafted HTTP requests. “heap […]

F5 has shipped fixes for a critical nginx flaw that lets a remote, unauthenticated attacker trigger a heap buffer overflow in the worker process with crafted HTTP requests. CVE-2026-42533 was patched on July 15 in nginx 1.30.4 (stable) and 1.31.3 (mainline), and in NGINX Plus 37.0.3.1; anyone on an earlier build should upgrade. Triggering it can crash or restart the worker, causing a denial of

View CSAF Summary Hitachi Energy is aware of a buffer overflow vulnerability that affects e-mesh EMS product versions listed in this document. Successful exploitation of this vulnerability could lead to a buffer overflow condition, potentially resulting in application outages (denial of service) and possible arbitrary code execution. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy e-mesh EMS are affected: Hitachi Energy e-mesh EMS 4.1.6, 4.4.2, 4.7.0 CVSS Vendor Equipment Vulnerabilities v3 8.1 Hitachi Energy Hitachi Energy e-mesh EMS Heap-based Buffer Overflow Background Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Switzerland Vulnerabilities Expand All + CVE-2026-42945 NGINX Plus and NGINX Open Source used in e-mesh EMS have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to ...

F5 released emergency updates for critical NGINX flaws (CVE-2026-42530, CVE-2026-42055) that could enable unauthenticated code execution. F5 has issued out-of-band patches for multiple NGINX vulnerabilities, including two critical flaws, respectively tracked as CVE-2026-42530 and CVE-2026-42055 (CVSS 9.2). The bugs affect HTTP modules and can be exploited remotely without authentication to trigger memory corruption, potentially causing […]

A critical NGINX vulnerability (CVE-2026-42945) disclosed last week is being exploited by attackers, VulnCheck security researcher Patrick Garrity revealed on Saturday. The vulnerability, dubbed NGINX Rift, can be reliably exploited to trigger a denial-of-service condition and can potentially allow for unauthenticated remote code execution, all achievable by sending a specially crafted HTTP request to a vulnerable NGINX instance. What is NGINX? NGINX is the most widely deployed web server and, as such, it’s one of … More → The post Attackers are exploiting critical NGINX vulnerability (CVE-2026-42945) appeared first on Help Net Security .

A critical NGINX flaw (CVE-2026-42945) is actively exploited, allowing crashes or possible code execution via malicious HTTP requests. A critical vulnerability in NGINX Plus and NGINX Open, tracked as CVE-2026-42945 (CVSS v4 score of 9.2), is already being actively exploited shortly after disclosure. “We’re seeing active exploitation of CVE-2026-42945 in F5 NGINX, a heap buffer […]

A newly disclosed security flaw impacting NGINX Plus and NGINX Open has come under active exploitation in the wild, days after its public disclosure, according to VulnCheck. The vulnerability, tracked as CVE-2026-42945 (CVSS score: 9.2), is a heap buffer overflow in ngx_http_rewrite_module affecting NGINX versions 0.6.27 through 1.30.0. According to AI-native security company depthfirst, the

Cybersecurity researchers have disclosed multiple security vulnerabilities impacting NGINX Plus and NGINX Open, including a critical flaw that remained undetected for 18 years. The vulnerability, discovered by depthfirst, is a heap buffer overflow issue impacting ngx_http_rewrite_module (CVE-2026-42945, CVSS v4 score: 9.2) that could allow an attacker to achieve remote code execution or cause a