Citrix NetScaler Out-of-Bounds Read Vulnerability
NetScaler — ADC
Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
9.8
87.2%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Mar 23, 2026
- Modified
- Jun 17, 2026
- Added to KEV
- Mar 30, 2026
- Federal patch due
- Apr 2, 2026
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
5 foundWeaponization
Public repositories whose name or description references CVE-2026-3055, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- fevar54/CVE-2026-3055---Citrix-NetScaler-Memory-Overread-PoC★ 1
PoC de CVE-2026-3055: memory overread en Citrix NetScaler ADC/Gateway para filtrar session IDs.
updated Aug 25, 2026
- l0lsec/check-cve-2026-3055-netscaler★ 1
Low-impact probe for Citrix NetScaler CVE-2026-3055 (SAML IdP memory overread)
updated Sep 4, 2026
- fevar54/CVE-2026-3055-Scanner---Herramienta-de-Detecci-n★ 1
Scanner de CVE-2026-3055: detecta NetScaler ADC/Gateway vulnerables a memory overread. Reportes JSON/HTML/CSV.
updated Aug 25, 2026
- 0xBlackash/CVE-2026-3055★ 0
CVE-2026-3055
updated Mar 29, 2026
- NetVanguard-cmd/CVE-2026-3055★ 0
updated Apr 19, 2026
References
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 base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2026-3055 actively exploited in the wild?
Yes. CVE-2026-3055 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Mar 30, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-3055?
87.2% - meaning FIRST.org's EPSS model estimates a 87.2% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-3055?
Yes - a public Nuclei template referencing CVE-2026-3055 exist in public repositories we checked. We also found 5 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2026-3055?
CVE-2026-3055 is classified under CWE-125 (CWE-125 Out-of-bounds Read).
Cross-checked against
Impactr finds and proves whether CVE-2026-3055 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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