{"cve":{"cve_id":"CVE-2026-88779","is_kev":true,"kev_date_added":"2026-10-04","kev_vendor_project":"Citrix","kev_product":"NetScaler","kev_vulnerability_name":"Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability","kev_short_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.","kev_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.","kev_due_date":"2026-10-07","kev_known_ransomware":false,"kev_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","kev_cwes":["CWE-119"],"epss_score":0.00592,"epss_percentile":0.47107,"epss_as_of":"2026-10-15","description":"Vulnerability in NetScaler ADC and NetScaler Gateway.\n\nThis 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.","published_at":"2026-10-04T02:35:35.525000Z","last_modified_at":"2026-10-05T13:35:24.663000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":8.7,"cvss_v4_vector":"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","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-119"],"nvd_references":["https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-10-04T06:32:05.945724Z","updated_at":"2026-10-06T21:36:59.240731Z"},"effective_severity":"HIGH","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-64.28","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-37.282","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-37.282","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-gateway","product_name":"NetScaler Gateway","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-64.28","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.41","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:0:14.1-73.41"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"13.1-64.28","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:0:13.1-64.28"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.41 FIPS","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:0:14.1-73.41 FIPS"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"13.1-37.282","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:0:13.1-37.282"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"0","version_start_inclusive":true,"version_end":"13.1-64.28","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:gateway:0:13.1-64.28"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.41","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:gateway:0:14.1-73.41"}],"exploit_refs":[],"news":[{"id":2336,"source":"The Hacker News","url":"https://thehackernews.com/2026/10/new-netscaler-zero-day-exploited-in.html","title":"New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline","summary":"Citrix has released security updates for a high-severity security flaw in NetScaler ADC and Citrix NetScaler Gateway that has been exploited as part of targeted zero-day attacks.\n\nThe vulnerability, tracked as CVE-2026-88779, carries a CVSS score of 8.7 out of 10.0.\n\n\"CVE-2026-88779 is a memory overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway that can lead to","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhV4of0Q-gWaIOffgWXdEfAxmI1ENcyrpDSSDjBurAHSpUuAI8lASQI5wrUvL3Evb0iqA31rRywo51olFOzoWe_lQ9cwN7Sp5QQw_2h-y44n0Va4vwlRQZipZ5fkm98BRmTOoVDPTs8pUMW_ClnH2GlPobgQQ33rNzL8EBnBW84aacH3dLXdyyLW9bBEqG5/s1600/citrix-offline.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-10-05T06:40:19Z","fetched_at":"2026-10-05T08:30:06.394778Z","trending_score":0.0007529159469531457,"cve_ids":["CVE-2026-88779"]},{"id":2334,"source":"BleepingComputer","url":"https://www.bleepingcomputer.com/news/security/citrix-patches-netscaler-saml-zero-day-exploited-in-attacks/","title":"Citrix patches NetScaler SAML zero-day exploited in attacks","summary":"Citrix has released emergency updates for a new NetScaler denial-of-service vulnerability tracked as CVE-2026-88779 that has been exploited in zero-day attacks, with researchers investigating whether it can also be exploited for remote code execution. [...]","thumbnail_url":null,"author":"Lawrence Abrams","published_at":"2026-10-04T21:58:01Z","fetched_at":"2026-10-04T22:00:06.242145Z","trending_score":0.0007193091055538098,"cve_ids":["CVE-2026-88779"]}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174","source_type":"MISC","tags":[]}],"timeline":[{"type":"cisa_reported","at":"2026-10-04T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-10-04T02:35:35.525000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-10-04T21:58:01Z","label":"First news coverage","source":"BleepingComputer"},{"type":"cvss_changed","at":"2026-10-06T21:36:59.240731Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-06T21:36:59.240731Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-06T21:36:59.240731Z","label":"CVSS score revised","source":"nvd"}]}