CVE-2026-3055 (GCVE-0-2026-3055)
Vulnerability from cvelistv5 – Published: 2026-03-23 20:21 – Updated: 2026-03-31 03:55Title
Insufficient input validation leading to memory overread
Summary
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 00:00 UTC
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://support.citrix.com/support-home/kbsearch/… | |
| https://labs.watchtowr.com/please-we-beg-just-one… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
Date Public
2026-03-23 19:20
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 119a0bc0-13a3-4c51-a2e3-cc7f180d7ed2
Exploited: Yes
Timestamps
First Seen: 2026-03-30
Asserted: 2026-03-30
Scope
Notes: Citrix NetScaler Out-of-Bounds Read Vulnerability | Affected: Citrix / NetScaler | Description: Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread. | 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 date: 2026-04-02 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-125 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | NetScaler |
| Due Date | 2026-04-02 |
| Date Added | 2026-03-30 |
| Vendorproject | Citrix |
| Vulnerabilityname | Citrix NetScaler Out-of-Bounds Read Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 63d70163-8189-4bd5-94a9-567a487e7197
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: Insufficient input validation leading to memory overread | Affected: NetScaler / ADC, Gateway | CVSS: 9.3 (CRITICAL) | EPSS: 0.04042 | Used in malware: unknown | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Insufficient input validation leading to memory overread |
| Cve Id | CVE-2026-3055 |
| Vendor | NetScaler |
| Ghsa Id | None |
| Product | ADC, Gateway |
| Added Date | 2026-06-01T00:00:00.000Z |
| Cvss Score | 9.3 |
| Epss Score | 0.04042 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.90303 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-3055 |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:09 CEST
| Updated: 2026-10-02 09:09 CEST
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"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-23T20:21:27.107Z",
"orgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"shortName": "NetScaler"
},
"references": [
{
"url": "https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Insufficient input validation leading to memory overread",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "50a63c94-1ea7-4568-8c11-eb79e7c5a2b5",
"assignerShortName": "NetScaler",
"cveId": "CVE-2026-3055",
"datePublished": "2026-03-23T20:21:27.107Z",
"dateReserved": "2026-02-23T18:00:08.900Z",
"dateUpdated": "2026-03-30T22:20:23.749Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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