CVE-2026-88779
Known exploited · CISA KEV
CISA federal remediation date Oct 7 · date passed
Vulnerabilities · 5h ago
Talos highlighted Citrix NetScaler ADC and NetScaler Gateway CVE-2026-88779, a memory overflow on CISA’s Known Exploited Vulnerabilities list, and the federal remediation date has already passed. The advisory lands in the same place operators feel the pressure most: the access appliance that sits in front of users and traffic.
A specially crafted request can make the device use more memory than it allocated, which can corrupt nearby data and destabilize the appliance or influence what it does next. Because NetScaler is often the front door for remote access, waiting for a maintenance window keeps that control point exposed instead of safely tucked behind it.
The lasting risk is operational: if the gateway or ADC is the path into the environment, deferring remediation to protect uptime preserves the very exposure attackers want. That makes the maintenance choice part of the vulnerability window, not separate from it.
Known exploited · CISA KEV
CISA federal remediation date Oct 7 · date passed
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Part of the PlainSec briefing for 2026-10-08