How severe is CVE-2026-3055?

No CVSS score has been assigned to CVE-2026-3055 yet. Review the advisory details and affected package list to assess your exposure.

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 release is recorded for CVE-2026-3055 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2026-3055 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2026-3055 if there is no patch (or I can't update yet)?

Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

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 4.0%, placing it in the 91th 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. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

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.

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 · ACTIVELY EXPLOITED

CVE-2026-3055

CVE-2026-3055 is a Out-of-bounds Read vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-03-30) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

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

2 products

Patched

See advisory

Exploits

None indexed

Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-03-30. Federal agencies were required to remediate by 2026-04-02.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-3055.

EPSS Exploitation Probability

via FIRST.org ↗

4.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

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

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2026-3055 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

How to detect CVE-2026-3055

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2026-3055 -u https://target

Template: Citrix NetScaler SAML IDP - Memory Overread
Severity: critical
Impact: Attackers can cause memory overread, potentially exposing sensitive information or causing application instability.
Remediation: Update to the latest version with the fix for this vulnerability.

Template by ProjectDiscovery nuclei-templates (watchtowr, shaikhyaser, DhiyaneshDk), MIT licensed. View the full template. Scan only systems you are authorised to test.

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

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CVE-2026-3055

Exploitation Status

Actively exploited in the wild

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

How to detect CVE-2026-3055

Frequently Asked Questions

Is CVE-2026-3055 in your dependencies?