Exploited CVEs / Citrix / CVE-2026-3055
CVE-2026-3055
Citrix NetScaler Out-of-Bounds Read Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-04-02 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Citrix Security Bulletins, linked below.
Actively exploited Citrix NetScaler vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2026-03-30.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-3055
Citrix NetScaler ADC and Gateway devices configured as a SAML identity provider leak memory through an out-of-bounds read, rated Critical at CVSS 9.8 with an 84% EPSS score and confirmed exploited since 2026-03-30. Memory overreads on NetScaler have historically yielded session tokens that let attackers bypass authentication entirely. Only SAML IDP configurations expose the flaw, which makes identifying those instances the first job.
Do this: Patch NetScaler appliances acting as SAML IDPs first, then terminate active sessions and rotate certificates in case tokens already leaked.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-3055
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-3055
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-04-02 (past due).
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2026-3055
The authoritative fix and affected-version list are published by the vendor. Find the NetScaler advisory on Citrix Security Bulletins.
Common questions about CVE-2026-3055
Is CVE-2026-3055 actively exploited?
Yes. CVE-2026-3055 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-03-30, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 78%.
What is the CISA deadline and required action for CVE-2026-3055?
CISA set the federal (BOD 22-01) remediation due date at 2026-04-02, which has passed; treat any unremediated system as overdue. The verbatim 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.
What fixes CVE-2026-3055?
The authoritative fix is in the vendor advisory: see Citrix Security Bulletins for the patched NetScaler versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-3055?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-3055's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
