CVE-2026-88779: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
CVSS 8.7 · High⚠ Actively exploited (CISA KEV)
8.7
CVSS score
High
Severity
Active
CISA KEV
No
Ransomware use
Oct 7, 2026
Patch deadline
⚠ Exploited in the wild. CISA added CVE-2026-88779 to its Known Exploited Vulnerabilities catalog on Oct 4, 2026, with a federal patch deadline of Oct 7, 2026 — meaning attackers are actively using it. If you run the affected software, patch it immediately.
Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.
Details
AffectedCitrix · NetScaler
WeaknessCWE-119
CVSS base score8.7 (High)
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XPublishedOct 4, 2026
Added to CISA KEVOct 4, 2026
Federal patch deadlineOct 7, 2026
Known ransomware useNot documented
Frequently asked questions
Is CVE-2026-88779 being actively exploited?
Yes — CISA lists CVE-2026-88779 in its Known Exploited Vulnerabilities (KEV) catalog, so it is confirmed exploited in the wild. Patch it as a priority.
What does CVE-2026-88779 affect?
CVE-2026-88779 affects Citrix · NetScaler.
How do I fix CVE-2026-88779?
Apply the vendor’s patch for the affected software. The federal patch deadline was Oct 7, 2026. Then check whether your personal data was exposed in any related breach.