CVE-2026-3055

Insufficient input validation leading to memory overread

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

Affected

NetScaler · ADC · Gateway

CVSS v4.0 CNA

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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:X

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

4.04% chance of exploitation in the next 30 days, 90th percentile

CISA KEV

added 2026-03-30

Nuclei

critical

Published

2026-03-23

Updated

2026-03-31

Proof-of-concept exploits (3)

• fevar54/CVE-2026-3055---Citrix-NetScaler-Memory-Overread-PoC1★ · 2026-03-31
• NetVanguard-cmd/CVE-2026-30550★ · 2026-04-19
• 0xBlackash/CVE-2026-30550★ · 2026-03-29

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-3055.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/citrix_netscaler_c…

Security advisories

• https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300
• https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netsc…

References

• CVE Record
• NVD entry

Related

• CVE-2023-21839
• CVE-2023-43654
• CVE-2024-21182
• CVE-2024-3094
• CVE-2024-42461
• CVE-2025-20343