ExploitedIn CISA KEVFix available

CVE-2026-3055

Q: Is CVE-2026-3055 actively exploited?

Yes. CVE-2026-3055 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-04-02.

Q: What is the CVSS score for CVE-2026-3055?

CVE-2026-3055 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation confirmed. First attested on 2026-03-30 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

Published2026-03-23
Fixed in14.1-60.58 · 13.1-37.262 · 13.1-62.23
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2026-03-2321:17CVE publishedNVD
2026-03-30Added to the CISA KEV catalogCISA KEV
2026-03-30Listed as exploited by GCVEGCVE
2026-03-30Exploitation first reportedCISA KEV
2026-03-3019:02SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-3055?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-3055?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Citrix NetScaler ADC

Branch	Affected	Fixed in	Source
14.1	≥ 14.1, < 14.1-60.58	14.1-60.58	NVD
13.1	≥ 13.1, < 13.1-37.262	13.1-37.262	NVD
13.1	≥ 13.1, < 13.1-62.23	13.1-62.23	NVD

Citrix NetScaler ADC

Branch	Affected	Fixed in	Source
14.1	≥ 14.1, < 14.1-60.58	14.1-60.58	NVD
13.1	≥ 13.1, < 13.1-62.23	13.1-62.23	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Citrix NetScaler ADC to 14.1-60.58 · 13.1-37.262 · 13.1-62.23
CISA’s 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.due 2026-04-02

Advisories and patches

support.citrix.comVendor Advisory

Detection

read 2026-10-23 19:25 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 5 repositories, unverified0xBlackash/CVE-2026-3055fevar54/CVE-2026-3055---Citrix-NetScaler-Memory-Overread-PoCfevar54/CVE-2026-3055-Scanner---Herramienta-de-Detecci-nl0lsec/check-cve-2026-3055-netscalerNetVanguard-cmd/CVE-2026-3055

CISA Known Exploited Vulnerability

Date Added: 2026-03-30
Patch Due Date: 2026-04-02
Ransomware Use: Unknown
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.

Sources

CISA KEVKEV entry2026-03-30
GCVEexploitation2026-03-30
CISA-ADPSSVC decisionactive2026-03-30
OpenCVESSVC decisionactive—
CNACVSS 4.09.3read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score4.0 %2026-10-22
PoC-in-GitHubproof of concept5read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 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/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
Published: 2026-03-23
Last Modified: 2026-06-17
NVD status: Analyzed

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

Is CVE-2026-3055 actively exploited?

Yes. CVE-2026-3055 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-04-02.

What is the CVSS score for CVE-2026-3055?

CVE-2026-3055 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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