Affects widely deployed Citrix NetScaler ADC/Gateway; service disruption across enterprises is likely and should be broadly communicated.
CVE-2026-88776
Memory overflow in Citrix NetScaler ADC/Gateway enabling crashes and DoS.
Is CVE-2026-88776 being exploited?
Not confirmed. CVE-2026-88776 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-88776?
CVE-2026-88776 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88776?
Yes. A fix has been recorded for CVE-2026-88776. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88776 affect?
CVE-2026-88776 affects Citrix NetScaler ADC (versions before 14.1-73.37, before 13.1-64.23; FIPS: before 14.1-73.37 & 13.1.37.279 NDcPP), Citrix NetScaler Gateway (versions before 14.1-73.37 and before 13.1-64.23). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88776?
Upgrade to fixed releases (e.g., 14.1-73.37, 13.1-64.23) per Citrix advisory.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can trigger a memory overflow via network requests, causing crashes, unpredictable behavior or Denial of Service.
Patch when possible