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
9.3
84.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (Vulnerable System)
- High
- Integrity (Vulnerable System)
- High
- Availability (Vulnerable System)
- High
- Confidentiality (Subsequent System)
- Low
- Integrity (Subsequent System)
- Low
- Availability (Subsequent System)
- Low
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
- Published
- Mar 23, 2026
- Modified
- Mar 31, 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
Proof-of-concept & exploitation references
Weaponization
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.
No public GitHub repositories referencing CVE-2026-3055 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
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 9.3 out of 10 (CVSS 4.0).
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?
84.0% - meaning FIRST.org's EPSS model estimates a 84.0% 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.
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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