CVE-2026-3055

Description

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

Overview

State: PUBLISHED
Assigner (CNA): NetScaler
CVSS severity: CRITICAL
CVSS score: 9.3 / 10
CVSS vector: 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
Effective score: 9.3 / 10 CRITICAL source: CNA overview
CWE(s): CWE-125
Reserved: 2026-02-23
Published: 2026-03-23 20:21 UTC
Last updated: 2026-03-31 03:55 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3055.json
Linked Threat: CVE-2026-3055 — Citrix NetScaler: Citrix NetScaler Out-of-Bounds Read Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Citrix NetScaler Out-of-Bounds Read Vulnerability
Vendor / project: Citrix
Product: NetScaler
Date added to KEV: 2026-03-30
Remediation 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.
Ransomware campaign use: Unknown
CISA notes: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368 ; https://nvd.nist.gov/vuln/detail/CVE-2026-3055
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-03-23 21:17:17 UTC
NVD last modified: 2026-03-31 13:18:14 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.8937 (probability of exploitation in next 30 days)
EPSS percentile: 99.56% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-14546
Assigner: NetScaler
Published: Mar 23, 2026, 8:21:27 PM
Updated: Mar 31, 2026, 3:55:32 AM
EUVD base score (CVSS 4.0): 9.3 / 10
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
EUVD-reported EPSS: 89.8600
Vendors: NetScaler
Products: Gateway (14.1 <66.59)

ADC (13.1 FIPS and NDcPP <37.262)

Gateway (13.1 <62.23)

ADC (14.1 <66.59)

ADC (13.1 <62.23)
Aliases: GHSA-wv7p-q4p2-p6pf

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

EUVD references (1)

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300

Affected products (2)

Vendor	Product	Versions	Platforms
NetScaler	ADC	`14.1` (affected), `13.1` (affected), `13.1 FIPS and NDcPP` (affected)	—
NetScaler	Gateway	`14.1` (affected), `13.1` (affected)	—

Affected products — CPE 2.3 (4) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

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:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://cwe.mitre.org/data/definitions/125.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-3055 rapid7:attackerkb.com
https://www.cve.org/CVERecord?id=CVE-2026-3055 rapid7:www.cve.org

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/ 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitThird Party Advisory
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-125`	no local data	2026-05-14 02:58 UTC
cve	`CVE-2026-3055`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Important Update: CVE Disclosures Now Live on the Citrix Community Site

web:www.netscaler.com

Cloud Software Group released builds on March 23, 2026 to address CVE-2026-3055 and CVE 2026 -4368. Our security team has reviewed this issue and published a full CVE disclosure blog — including technical details, affected versions, and recommended remediation steps — on our community site.

2026-05-14 11:16 UTC
Nvd - Cve-2026-3055

web:nvd.nist.gov

An official website of the United States government NVD MENU

2026-05-14 11:16 UTC
CVE-2026-3055: Citrix NetScaler Token Theft — Patch Now

web:orthogonal.info

Quick Answer: CVE-2026-3055 is a critical Citrix NetScaler vulnerability actively exploited in the wild. Patch immediately to the latest NetScaler firmware; if patching is delayed, block external access to the management interface and monitor for indicators of compromise.

2026-05-14 11:16 UTC
Urgent Alert: NetScaler bug CVE-2026-3055 probed by attackers could ...

web:securityaffairs.com

Attackers are actively probing a critical Citrix NetScaler flaw ( CVE-2026-3055 ) that can leak sensitive data via a memory overread issue.

2026-05-14 11:16 UTC
NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-3055 ...

web:support.citrix.com

CVE 2026-3055 was identified internally through our ongoing security reviews and broader efforts to strengthen the security of the product. Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible.

2026-05-14 11:16 UTC
Citrix urges admins to patch NetScaler flaws as soon as possible

web:www.bleepingcomputer.com

Citrix has also shared detailed guidance on how to identify and patch NetScaler instances vulnerable to CVE-2026-3055 .

2026-05-14 11:16 UTC
CVE-2026-3055 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Apply the latest security update for Citrix NetScaler ADC and NetScaler Gateway as released by Citrix. If a patch is not yet available, disable or restrict external access to the SAML IDP functionality on the affected appliances.

2026-05-14 11:16 UTC
CVE Record: CVE-2026-3055

web:www.cve.org

Vulnerability detail for CVE-2026-3055 Notice: Expanded keyword searching of CVE Records (with limitations) is now available in the search box above. Learn more here.

2026-05-14 11:16 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-04-02 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-3055.json.

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