CVE-2026-3055
CriticalExploitedPublic exploitInsufficient input validation leading to memory overread
Published Mar 23, 2026 · Updated Mar 31, 2026
Key Facts
Patch immediately- CVE-2026-3055 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Netscaler Application Delivery Controller (Citrix), Netscaler Gateway (Citrix).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 29, 2026. Public exploit code is available.
- EPSS estimates a 4.0% probability of exploitation in the next 30 days.
- Fixed versions are available, including Netscaler Application Delivery Controller 37.262, Netscaler Application Delivery Controller 62.23, Netscaler Application Delivery Controller 66.59.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.3
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/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
EPSS (30-day exploit likelihood)
4.0%
Higher than 90.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-3055 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 30, 2026 | Apr 2, 2026 | Not reported |
| Industry KEV feed | Mar 29, 2026 | Apr 2, 2026 | Not reported |
| CIRCL KEV | Mar 30, 2026 | Apr 2, 2026 | Not reported |
| ENISA EUVD | Mar 30, 2026 | n/a | Not reported |
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.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Netscaler Application Delivery ControllerCitrix | >= 14.1 | 13.1-62.23 |
| Netscaler GatewayCitrix | >= 14.1 | 13.1-62.23 |
Patched Releases
Netscaler Application Delivery Controller
37.262, 62.23, 66.59, 13.1-37.262, 13.1-62.23
Netscaler Gateway
13.1-62.23, 62.23, 66.59
Timeline
Publicly disclosed
Mar 23, 2026
Added to Industry KEV feed
Mar 29, 2026
Added to CISA KEV
Mar 30, 2026
Added to CIRCL KEV
Mar 30, 2026
Added to ENISA EUVD
Mar 30, 2026
Last updated
Mar 31, 2026
Weakness Type
- CWE-125 Out-of-bounds Read
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Affected: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 29, 2026.
Yes. It was added on Mar 30, 2026 with a federal remediation due date of Apr 2, 2026.
Public exploit code is available.
Fixed versions are available, including Netscaler Application Delivery Controller 37.262, Netscaler Application Delivery Controller 62.23, Netscaler Application Delivery Controller 66.59.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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