How severe is CVE-2026-3055?

CVE-2026-3055 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3055 being actively exploited?

Yes. CVE-2026-3055 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-03-30, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-3055?

CVE-2026-3055 primarily affects Citrix Netscaler Application Delivery Controller. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-3055?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-3055 have an EU (EUVD) identifier?

Yes. CVE-2026-3055 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14546. It is also flagged as exploited in the EUVD (since 2026-03-30).

When was CVE-2026-3055 published?

CVE-2026-3055 was published on 2026-03-23 and last updated on 2026-06-17.

CVE-2026-3055

CVE-2026-3055 is a critical-severity vulnerability in Citrix Netscaler Application Delivery Controller with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-03-30). The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 84% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-03-30)
EU (EUVD) id: EUVD-2026-14546
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-03-30)
Weakness: CWE-125
Affected product: Citrix Netscaler Application Delivery Controller
Published: 2026-03-23
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-3055?: Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
How severe is CVE-2026-3055?: CVE-2026-3055 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3055 being actively exploited?: Yes. CVE-2026-3055 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-03-30, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-3055?: CVE-2026-3055 primarily affects Citrix Netscaler Application Delivery Controller. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-3055?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-3055 have an EU (EUVD) identifier?: Yes. CVE-2026-3055 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14546. It is also flagged as exploited in the EUVD (since 2026-03-30).
When was CVE-2026-3055 published?: CVE-2026-3055 was published on 2026-03-23 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

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