Widely used Citrix NetScaler ADC/Gateway; memory overread could leak data and affect enterprise networks.
CVE-2026-8451
Memory overread in NetScaler ADC/Gateway when acting as SAML IDP
Is CVE-2026-8451 being exploited?
Not confirmed. CVE-2026-8451 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. EPSS currently estimates a 16% probability of exploitation in the next 30 days.
How severe is CVE-2026-8451?
CVE-2026-8451 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-2026-8451?
Yes. A fix has been recorded for CVE-2026-8451. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-8451 affect?
CVE-2026-8451 affects Citrix NetScaler ADC, Citrix NetScaler Gateway. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-8451?
Patch when released; disable SAML IDP exposure if possible.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Memory overread allows remote read of sensitive data from the appliance via SAML IDP configuration.
Patch when possible
- affected>= 14.1 and < 72.61
- affected>= 13.1 and < 63.18
- affected>= 14.1 FIPs and < 72.61
- affected>= 13.1 FIPS and NDcPP and < 37.272
- affected>= 14.1 and < 72.61
- affected>= 13.1 and < 63.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.