Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
CISA KEV·Added 2026-03-30 — agencies required to remediate by 2026-04-02

CVE-2026-3055

CRITICAL

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

Published
Mar 23, 2026
Updated
Jun 17, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

EPSS Exploitation Probability

via FIRST.org ↗
78.3%probability of exploitation in next 30 days
Very High Risk100th percentile-5.66%
30.6%53.8%76.9%100.0%44.3%45.2%89.9%84.0%78.3%Apr 26Jun 26Jul 26

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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

Affected Products

2 products · 6 configurations
Application
netscaler application delivery controllercitrix
≥ 14.1 && < 14.1-60.58
range
Application
netscaler gatewaycitrix
≥ 14.1 && < 14.1-60.58
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every citrix netscaler application delivery controller deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the citrix netscaler application delivery controller security patch or hotfix for CVE-2026-3055 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2026-3055 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2026-3055. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread
O3 Security · Runtime Protection

Is CVE-2026-3055 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2026-3055 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

CVE-2026-3055: Netscaler Application Delivery Controller Out-of… | O3 Security