What is CVE-2026-3055?
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Timeline
- 2026-03-23Published to the U.S. National Vulnerability Database (NVD)
- 2026-03-29First covered in a defend.network daily briefing
- 2026-03-30Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-04-02CISA federal remediation deadline (BOD 22-01)
- 2026-06-17NVD record last updated
CISA Known Exploited Vulnerability
Citrix NetScaler Out-of-Bounds Read Vulnerability
Affected product
Citrix NetScaler
NVD also lists CPE entries for: Citrix Netscaler Application Delivery Controller, Citrix Netscaler Gateway
Remediation Steps
- Identify all Citrix NetScaler ADC and Gateway deployments in your infrastructure
- Apply Citrix security patches addressing memory overread vulnerability
- Restrict access to NetScaler management interfaces via IP whitelisting
- Enable input validation and WAF rules on gateway endpoints
- Monitor for suspicious memory access patterns and connection spikes
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300
- https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055
- https://support.citrix.com/article/CTX000000
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://nvd.nist.gov/vuln/detail/CVE-2026-3055
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 5 of March 2026 (March 30 – April 5)
- Citrix exploited; Axios npm RAT supply-chain; OpenAI data theft (2026-03-31)
- FBI Director email breached; Citrix & F5 zero-days exploited (2026-03-30)
- Iran breaches FBI Director email; Citrix & F5 zero-days unpatched (2026-03-29)
Related vulnerabilities
- CVE-2026-88779 – Citrix NetScaler (same product)
- CVE-2026-88771 – Citrix NetScaler (same product)
- CVE-2026-88772 – Citrix NetScaler (same product)
- CVE-2026-19490 – Citrix NetScaler (same product)
- CVE-2025-5777 – Citrix NetScaler ADC And Gateway (same product)
- CVE-2026-8452 – Citrix NetScaler ADC And NetScaler Gateway (same product)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.