Critical 9.3Known exploited (CISA KEV)Published Mar 23, 2026

CVE-2026-3055Insufficient input validation leading to memory overread

Updated under an hour ago (Oct 27, 2026, 1:10 AM ET)

Does this affect you?

It affects NetScaler ADC and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 30, 2026; federal agencies had to remediate by Apr 2, 2026. Treat that date as your deadline.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for NetScaler ADC

Exploited in the last 30 days

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

CVSS: 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Weakness (CWE): CWE-125
Known exploited: Added to CISA KEV Mar 30, 2026; federal remediation due Apr 2, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 91.49% (percentile 100)
Assigned by: NetScaler
NVD analysis: Analyzed
Record last updated: Mar 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

NetScaler ADC netscaler:adc (from the name)	from 14.1 before 66.59; from 13.1 before 62.23; from 13.1 FIPS and NDcPP before 37.262	CNA record
NetScaler Gateway netscaler:gateway (from the name)	from 14.1 before 66.59; from 13.1 before 62.23	CNA record
citrix netscaler_application_delivery_controller citrix:netscaler_application_delivery_controller	from 13.1 before 13.1-37.262; from 13.1 before 13.1-37.262; from 13.1 before 13.1-62.23; from 14.1 before 14.1-60.58	NVD
citrix netscaler_gateway citrix:netscaler_gateway	from 13.1 before 13.1-62.23; from 14.1 before 14.1-60.58	NVD

References

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300	vendor-advisory
https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/	exploit, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.