{"schemaVersion":3,"id":"CVE-2026-76992","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The CODESYS Gateway Client allocates memory based on a size field in a gateway response without enforcing an appropriate upper limit. An unauthenticated remote attacker controlling a malicious gateway can exploit this behavior to trigger excessive memory consumption, resulting in a denial-of-service condition thus leading to a total loss of availablity.","dates":{"published":"2026-09-30T11:07:45.751Z","modified":"2026-09-30T15:28:07.834Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.7,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.7,"severity":"high","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.7,"severity":"high","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/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00327,"percentile":0.24351,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-01T00:00:00.000Z","score":0.00573,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00327,"percentile":0.24351}],"last30":[{"date":"2026-10-01T00:00:00.000Z","score":0.00573,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00327,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00327,"percentile":0.24351}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"codesys","product":"development system 3","name":"Development System 3","label":"development system 3","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/development_system_3"},{"vendor":"codesys","product":"edge gateway for linux","name":"Edge Gateway for Linux","label":"edge gateway for linux","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.15.0.0, < 4.23.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.15.0.0, < 4.23.0.0","eol":null,"hubHref":"/vendor/codesys/edge_gateway_for_linux"},{"vendor":"codesys","product":"edge gateway for windows","name":"Edge Gateway for Windows","label":"edge gateway for windows","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/edge_gateway_for_windows"},{"vendor":"codesys","product":"gateway","name":"gateway","label":"gateway","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/gateway"},{"vendor":"codesys","product":"hmi_sl","name":"hmi sl","label":"hmi_sl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/hmi_sl"},{"vendor":"codesys","product":"opc da server sl","name":"OPC DA Server SL","label":"opc da server sl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/opc_da_server_sl"},{"vendor":"codesys","product":"plchandler","name":"plchandler","label":"plchandler","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/plchandler"},{"vendor":"codesys","product":"runtime_toolkit","name":"runtime toolkit","label":"runtime_toolkit","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0.0.0, < 3.5.22.40","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0.0, < 3.5.22.40","eol":null,"hubHref":"/vendor/codesys/runtime_toolkit"}],"affectedCount":8,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.certvde.com/en/advisories/VDE-2026-094/","label":"www.certvde.com/en/advisories/VDE-2026-094/","hostname":"www.certvde.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-30T11:07:45.751Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-30T15:28:07.834Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T13:47:26.132Z","stale":false,"partial":false}}