CVE-2026-88779: Memory overflow vulnerability leading to Denial of Service

In CISA’s Known Exploited Vulnerabilities catalog: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability.

Added 2026-10-04, federal remediation due 2026-10-07. Known ransomware use: Unknown.

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.