Attackers Probing Critical Citrix NetScaler Vulnerability (CVE-2026-3055)

Attackers are actively probing a critical Citrix NetScaler vulnerability (CVE-2026-3055) with a CVSS score of 9.3, which affects NetScaler ADC and Gateway appliances. The flaw stems from a memory overread issue that could lead to the leakage of sensitive data. Citrix released security updates this week addressing this and another NetScaler vulnerability. No specific exploitation instances or compromised organizations were disclosed, but the vulnerability is under active reconnaissance by threat actors. The advisory targets administrators of Citrix NetScaler deployments without detailing affected versions or mitigation steps beyond patching.