CVE-2026-88779

Memory overflow vulnerability leading to Denial of Service

HIGH

7.5

CVSS Score

Published: October 4, 2026 at 02:35 AM UTC

Updated: October 5, 2026 at 01:35 PM UTC

4 products affected across 2 vendorsNetScaler GatewayNetscaler Application Delivery ControllerADC

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Severity

HIGH7.5

Exploitation

CISA KEV

Exploit prediction

EPSS 11%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score11.4%

EPSS (Exploit Prediction Scoring System) estimates a 11.4% chance this CVE is exploited in the wild within the next 30 days — higher than 96% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

Required Action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Ransomware Use

Unknown

Added to KEV

Oct 4, 2026

Remediation Due

Oct 7, 2026

24 days overdue

Notes

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174

https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/

BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk

Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk

https://nvd.nist.gov/vuln/detail/CVE-2026-88779

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Netscaler Application Delivery Controller · Citrix

95%

13.1 ≤ v < 13.1-37.28213.1 ≤ v < 13.1-64.2814.1 ≤ v < 14.1-73.4114.1-66.68 ≤ v ≤ 14.1-73.41

Affected range stops below 13.1-37.282, so it looks safe — our inference, not a vendor statement

Affected range stops below 13.1-64.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1-73.41, so it looks safe — our inference, not a vendor statement

NetScaler Gateway · Citrix

95%

13.1 ≤ v < 13.1-64.2814.1 ≤ v < 14.1-73.41

Affected range stops below 13.1-64.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1-73.41, so it looks safe — our inference, not a vendor statement

ADC · Netscaler

60%

v < 13.1-37.282v < 13.1-64.28v < 14.1-73.41v < 14.1-73.41 FIPS

Affected range stops below 13.1-37.282, so it looks safe — our inference, not a vendor statement

Affected range stops below 13.1-64.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1-73.41, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1-73.41 FIPS, so it looks safe — our inference, not a vendor statement

Gateway · Netscaler

60%

v < 13.1-64.28v < 14.1-73.41

Affected range stops below 13.1-64.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.1-73.41, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory

Source: cverecord

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174

MitigationVendor Advisory

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-119

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