{"schemaVersion":3,"id":"CVE-2026-40965","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a vulnerability where EC (Elliptic Curve) private keys are inadvertently exposed through the public /token_keys endpoint. This endpoint is designed to provide public key material for JWT token verification but incorrectly exposes private key components for EC keys. The vulnerability affects deployments using EC keys for JWT token signing. The vulnerability does not affect RSA key configurations, only deployments using EC keys for JWT signing.\n\nAffected versions:\n- uaa_release: v76.12.0 through v78.12.0 (inclusive); fixed in v78.13.0 or later\n- CF Deployment: v30.0.0 through v56.0.0 (inclusive); fixed in v56.1.0 or later (bundles uaa_release v78.13.0)","dates":{"published":"2026-06-01T21:22:07.653Z","modified":"2026-06-03T03:56:02.003Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":10,"severity":"critical","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":10,"severity":"critical","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":10,"severity":"critical","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":10,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00456,"percentile":0.38244,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.10999999999999999,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00346},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00456,"percentile":0.38244}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00346,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00456,"percentile":0.38244}]},"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-200","name":"Exposure of Sensitive Information to an Unauthorized Actor","description":"The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/200.html"}],"affected":[{"vendor":"cloud foundry foundation","product":"cf deployment","name":"CF Deployment","label":"cf deployment","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 30.0.0, < 56.1.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 30.0.0, < 56.1.0","eol":null,"hubHref":"/vendor/cloud_foundry_foundation/cf_deployment"},{"vendor":"cloud foundry foundation","product":"uaa_release","name":"uaa_release","label":"uaa_release","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 76.12.0, < 78.13.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 76.12.0, < 78.13.0","eol":null,"hubHref":"/vendor/cloud_foundry_foundation/uaa_release"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.cloudfoundry.org/blog/cve-2026-40965-uaa-ec-private-key-disclosure/","label":"www.cloudfoundry.org/blog/cve-2026-40965-uaa-ec-private-key-disclosure/","hostname":"www.cloudfoundry.org","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-06-01T21:22:07.653Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-03T03:56:02.003Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:41:04.597Z","stale":false,"partial":false}}