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By Igal Zeifman

Sample of assets impacted by NGINX nginx-poolslip vulnerability, identified by the CyCognito Platform What is CVE-2026-9256? CVE-2026-9256, publicly nicknamed “nginx-poolslip,” is a heap buffer overflow in the ngx_http_rewrite_module component of NGINX Plus and NGINX Open Source. The flaw is triggered when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. Under these conditions, NGINX underestimates the length of the output after URI escaping, producing an out-of-bounds write inside the worker process memory pool. The…

Read more about Emerging Threat: (CVE-2026-9256) NGINX Heap Buffer Overflow via Rewrite Module
By Igal Zeifman

A cross-site scripting vulnerability in Microsoft Exchange Server’s Outlook Web Access lets an unauthenticated attacker execute arbitrary JavaScript in a victim’s browser session by sending a specially crafted email, and is already being exploited in the wild.

Read more about Emerging Threat: (CVE-2026-42897) Microsoft Exchange OWA Cross-Site Scripting via Crafted Email