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CVE-2026-3055

CRITICAL9.8
CISA KEV

Published 2026-03-23 · Updated 2026-06-17 · Source 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5

Summary

CVE-2026-3055 is a critical-severity (CVSS 9.8) vulnerability in Citrix NetScaler. CISA added it to the Known Exploited Vulnerabilities catalog on March 30, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 2, 2026. CISA does not currently list it as used in ransomware campaigns. Citrix has 27 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

All 27 known-exploited Citrix vulnerabilities →

Description

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-125

CISA Known-Exploited Vulnerability

Product: Citrix — NetScaler

Name: Citrix NetScaler Out-of-Bounds Read Vulnerability

Date added: 2026-03-30 · Due: 2026-04-02

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.

View on NVD