How severe is CVE-2026-3055?

CVE-2026-3055 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-3055?

Affected package information for CVE-2026-3055 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2026-3055?

No fixed version has been published for CVE-2026-3055 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2026-3055 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-3055 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-3055?

CVE-2026-3055 has an EPSS (Exploit Prediction Scoring System) score of 89.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2026-3055 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2026-3055 (Citrix NetScaler Out-of-Bounds Read Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-03-30. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-04-02. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2026-3055?

CVE-2026-3055 is classified as Out-of-bounds Read (CWE-125). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2026-3055?

CVE-2026-3055 affects citrix netscaler application delivery controller; citrix netscaler gateway. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2026-3055?

A Nuclei detection template exists for CVE-2026-3055, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2026-3055 published, and has it been updated?

CVE-2026-3055 was published on March 23, 2026 and was last updated on March 31, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

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

Mar 31, 2026

Affected

0 pkgs

Patched

None yet

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

89.9%probability of exploitation in next 30 days

Very High Risk100th percentile+0.06%

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

Frequently Asked Questions

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

O3 Security · Impact-Aware SCA

Is CVE-2026-3055 in your stack?

O3 detects CVE-2026-3055 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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