CVE-2026-3055

NetScaler ADC, NetScaler Gateway

Published 23 Mar 2026 · updated 17 Jun 2026 · Analyzed

9.3 Critical · CVSS 4.0, CNA

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 30 Mar 2026, with a remediation deadline of 2 Apr 2026 for US federal agencies.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

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

References

support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300 · Vendor Advisory
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
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055 · US Government Resource