CVE-2026-88779 (GCVE-0-2026-88779)

Vulnerability from cvelistv5 – Published: 2026-10-04 02:35 – Updated: 2026-10-05 03:55
VLAI CISA ENISA Previdian
Title
Memory overflow vulnerability leading to Denial of Service
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-04 00:00 UTC
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
Impacted products
Vendor Product Version CPE status
NetScaler ADC Affected: 0 , < 14.1-73.41 (Patch)
Affected: 0 , < 13.1-64.28 (Patch)
Affected: 0 , < 14.1-73.41 FIPS (Patch)
Affected: 0 , < 13.1-37.282 (Patch)
guessed Create a notification for this product.
NetScaler Gateway Affected: 0 , < 14.1-73.41 (Patch)
Affected: 0 , < 13.1-64.28 (Patch)
guessed Create a notification for this product.
Date Public
2026-10-04 02:19
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 927d147d-af17-4c93-a9e6-86641fe38e2c

Vulnerability ID: CVE-2026-88779

Status: Confirmed

Status Updated: 2026-10-04 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-04
Asserted: 2026-10-04
Scope
Notes: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability | Affected: Citrix / NetScaler | Description: 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. | Due date: 2026-10-07 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-119
Feed CISA Known Exploited Vulnerabilities Catalog
Product NetScaler
Due Date 2026-10-07
Date Added 2026-10-04
Vendorproject Citrix
Vulnerabilityname Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-04 20:00 UTC | Updated: 2026-10-04 20:00 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a322c452-ef62-4881-96bf-23b1fb7c8b2b

Vulnerability ID: CVE-2026-88779

Status: Confirmed

Status Updated: 2026-10-02 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-02
Asserted: 2026-10-02
Scope
Notes: Affected: Citrix / Citrix NetScaler ADC, Citrix NetScaler Gateway | Description: Memory overflow vulnerability leading to Denial of Service. | Patched since: 2026/10/04 | Exploitation type: unknown | CWEs: CWE-119 | Origin source: CNW | Notes: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-119
Euvd EUVD-2026-92065
Notes https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product Citrix NetScaler ADC, Citrix NetScaler Gateway
Datereported 2026/10/02
Originsource CNW
Patchedsince 2026/10/04
Vendorproject Citrix
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-10-04 11:00 UTC | Updated: 2026-10-04 11:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f9546ed0-8bec-45b1-be2d-83be14550f68

Vulnerability ID: CVE-2026-88779

Status: Confirmed

Status Updated: 2026-10-04 07:14 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-04
Asserted: 2026-10-04
Scope
Notes: Memory overflow vulnerability leading to Denial of Service | Affected: NetScaler / ADC, Gateway | CVSS: 8.7 (HIGH) | EPSS: 0.00276 | Used in malware: unknown | Listed 12 hours ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Memory overflow vulnerability leading to Denial of Service
Cve Id CVE-2026-88779
Vendor NetScaler
Ghsa Id GHSA-56R3-M27M-8P62
Product ADC, Gateway
Added Date 2026-10-04T07:14:00.000Z
Cvss Score 8.7
Epss Score 0.00276
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.18203
Used In Malware unknown
Vulnerability Id CVE-2026-88779
Ahead Of Cisa Kev 
{
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  "unit": "hour"
}
Not Yet In Cisa Kev False
References
Created: 2026-10-05 08:01 UTC | Updated: 2026-10-05 08:01 UTC
Show details on NVD website
To clipboard 

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        "dateReserved": "2026-09-10T07:14:57.370Z",
        "dateUpdated": "2026-10-05T03:55:38.096Z",
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  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.