{"id":"CVE-2026-3055","kind":"vulnerability","aliases":["CVE-2026-3055"],"related":[],"title":"Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory…","description":"Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Citrix NetScaler ADC and NetScaler Gateway contain an out-of-bounds read flaw when configured as a SAML identity provider. An attacker can read memory beyond the intended buffer, which can expose sensitive data held in the appliance's memory.","severity":"critical","cvss":9.8,"epss":null,"exploited":true,"exploited_at":"2026-03-30T00:00:00+00:00","products":[{"name":"Citrix NetScaler","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["13.1-37.262"],"affected":">= 13.1, < 13.1-37.262","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["13.1-62.23"],"affected":">= 13.1, < 13.1-62.23","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["14.1-60.58"],"affected":">= 14.1, < 14.1-60.58","ecosystem":"vendor"},{"name":"citrix netscaler gateway","fixed":["13.1-62.23"],"affected":">= 13.1, < 13.1-62.23","ecosystem":"vendor"},{"name":"citrix netscaler gateway","fixed":["14.1-60.58"],"affected":">= 14.1, < 14.1-60.58","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["citrix-netscaler","exploited","infrastructure","netscaler-gateway","saml-idp","self-hosted"],"not_affected_if":["managed-hosting","not-saml-idp"],"how_to_check":"Check whether the NetScaler is configured as a SAML IDP (unknown exact command in sources).\nReview the vendor advisory for affected builds: unknown in sources.\nConfirm the appliance firmware version against the vendor's fixed list: unknown in sources.","fix":"Apply the vendor mitigation or fixed firmware per Citrix guidance; if unavailable, discontinue use of the product per CISA direction.\nFixed version: unknown in sources.","status":"open","published_at":"2026-03-23T21:17:17+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:38:59+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:38:59Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigation or fixed firmware per Citrix guidance; if unavailable, discontinue use of the product per CISA direction.\nFixed version: unknown in sources.","reach":"internet","summary":"Citrix NetScaler ADC and NetScaler Gateway contain an out-of-bounds read flaw when configured as a SAML identity provider. An attacker can read memory beyond the intended buffer, which can expose sensitive data held in the appliance's memory.","category":"infrastructure","who_cares":["citrix-netscaler","netscaler-gateway","saml-idp","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker reads appliance memory, potentially exposing credentials or session secrets","analyst_note":"Find the Citrix security bulletin for CVE-2026-3055 to confirm affected versions, fixed builds and the exact SAML IDP configuration trigger; the KEV entry alone gives no versions.","how_to_check":"Check whether the NetScaler is configured as a SAML IDP (unknown exact command in sources).\nReview the vendor advisory for affected builds: unknown in sources.\nConfirm the appliance firmware version against the vendor's fixed list: unknown in sources.","needs_analyst":true,"not_affected_if":["not-saml-idp","managed-hosting"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000513,"input_tokens":2584,"output_tokens":509,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':150C '-2026':20A,23A '-3055':21A,24A '22':149C 'action':140C 'adc':6A,64B,105C,108C,116C 'appli':141C 'applianc':100B 'applic':147C 'application':29A,34A,39A 'attack':84B 'beyond':88B 'bod':148C 'bound':73B,125C 'buffer':91B 'cisa':138C 'citrix':25A,27A,32A,37A,42A,45A,49B,62B,103C,107C,112C 'citrix-netscal':48B 'cloud':153C 'configur':11A,77B,129C 'contain':68B,120C 'controller':31A,36A,41A 'cve':19A,22A 'data':96B 'delivery':30A,35A,40A 'discontinu':156C 'exploit':51B 'expos':94B 'fip':117C 'flaw':75B 'follow':146C 'former':106C,111C 'gateway':9A,44A,47A,55B,67B,110C,113C 'guidanc':151C 'held':97B 'host':61B 'ident':81B 'idp':15A,58B,133C 'infrastructur':52B 'input':2A 'instruct':145C 'insuffici':1A 'intend':90B 'lead':16A,134C 'memori':18A,87B,102B,136C 'mitig':142C,162C 'ndcpp':119C 'netscal':5A,8A,50B,54B,63B,66B,104C,109C,115C 'netscaler':26A,28A,33A,38A,43A,46A 'netscaler-gateway':53B 'out-of-bound':70B,122C 'overread':137C 'per':143C 'product':160C 'provid':82B 'read':74B,86B,126C 'requir':139C 'saml':14A,57B,80B,132C 'saml-idp':56B 'self':60B 'self-host':59B 'sensit':95B 'servic':154C 'unavail':164C 'use':157C 'valid':3A 'vendor':144C 'vulner':127C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-03-23T21:17:17+00:00","kev":{"dateAdded":"2026-03-30","dueDate":"2026-04-02","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-3055","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-3055","severity":null,"published_at":"2026-03-30T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T16:39:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-3055","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3055","severity":null,"published_at":"2026-03-23T21:17:17+00:00","modified_at":"2026-06-17T10:42:58+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}