CVE-2026-88779: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

Patch now

HIGH 7.5EXPLOITEDREMOTEUPGRADEUPGRADE

CVE-2026-88779 is a high-severity flaw (CVSS 7.5) affecting netscaler application delivery controller, netscaler gateway, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

Why this priority

High severity
Exploited in the wild (CISA KEV)
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	Yes, fix due 2026-10-07
Weakness	CWE-119
Published	2026-10-04
Last modified	2026-10-05

Publisher (CNA): NetScaler · Vendor: citrix

Last updated 2026-10-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-04Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-10-04 04:16 UTCPublished CVE record published
2026-10-05 13:35 UTCUpdated Record last modified
2026-10-07Deadline CISA due date for US federal agencies to patch

citrix netscaler application delivery controller UPGRADE

Affected: >= 13.1 and < 13.1-37.282 · >= 13.1 and < 13.1-64.28 · >= 14.1 and < 14.1-73.41 · >= 14.1-66.68 and <= 14.1-73.41

Fixed in: 13.1-37.282, 13.1-64.28, 14.1-73.41

Safe to downgrade to: a release before 13.1

1. Check installed version

apt-cache policy netscaler-application-delivery-controller || rpm -q netscaler-application-delivery-controller || netscaler-application-delivery-controller --version

2. UPGRADE to 13.1-37.282 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade netscaler-application-delivery-controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netscaler-application-delivery-controller

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 13.1 (Debian / Ubuntu)

apt-cache madison netscaler-application-delivery-controller sudo apt install netscaler-application-delivery-controller=<VERSION_BEFORE_13.1> sudo apt-mark hold netscaler-application-delivery-controller

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list netscaler-application-delivery-controller sudo dnf downgrade netscaler-application-delivery-controller-<VERSION_BEFORE_13.1> sudo dnf versionlock add netscaler-application-delivery-controller

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

citrix netscaler gateway UPGRADE

Affected: >= 13.1 and < 13.1-64.28 · >= 14.1 and < 14.1-73.41

Fixed in: 13.1-64.28, 14.1-73.41

Safe to downgrade to: a release before 13.1

1. Check installed version

apt-cache policy netscaler-gateway || rpm -q netscaler-gateway || netscaler-gateway --version

2. UPGRADE to 13.1-64.28 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade netscaler-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netscaler-gateway

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 13.1 (Debian / Ubuntu)

apt-cache madison netscaler-gateway sudo apt install netscaler-gateway=<VERSION_BEFORE_13.1> sudo apt-mark hold netscaler-gateway

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list netscaler-gateway sudo dnf downgrade netscaler-gateway-<VERSION_BEFORE_13.1> sudo dnf versionlock add netscaler-gateway

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source

sudo dnf upgrade --advisory=FEDORA-2026-0602a84203

Advisories and coverage

Official advisories

CERT-FR Alerts: Multiples vulnérabilités dans Citrix NetScaler ADC et Gateway (28 septembre 2026) 2026-09-28

Research and news

Rapid7 Blog: Rapid7 Analysis: NetScaler intrusions chaining CVE-2026-88771 and CVE-2026-88779 2026-10-19

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-88779?

netscaler application delivery controller: upgrade to 13.1-37.282, 13.1-64.28, 14.1-73.41; netscaler gateway: upgrade to 13.1-64.28, 14.1-73.41. Exact commands for each OS are on this page.

Is CVE-2026-88779 being exploited?

Yes. CVE-2026-88779 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-88779 affect?

CVE-2026-88779 affects netscaler application delivery controller, netscaler gateway. Severity is high (CVSS 7.5). Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

How urgent is CVE-2026-88779?

Priority 68/100. High severity; Exploited in the wild (CISA KEV); Remotely exploitable, no login, no user action

Software pages

Citrix vulnerabilities

Related CVEs

CVE-2026-19490 CRITICAL 9.8 EXPLOITED UPGRADE UPGRADE Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
CVE-2026-88771 CRITICAL 9.8 EXPLOITED UPGRADE UPGRADE Citrix NetScaler Improper Input Validation Vulnerability
CVE-2026-88772 HIGH 8.1 EXPLOITED UPGRADE UPGRADE Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
CVE-2026-8452 CRITICAL 9.8 EXPLOITED UPGRADE UPGRADE Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

References

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