CVE-2026-40975

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.Bean; import org.springframework.core.env.Environment; @SpringBootApplication public class VulnerableApp { public static void main(String[] args) { // Start the application with a vulnerable Spring Boot version SpringApplication.run(VulnerableApp.class, args); } @Bean public String demonstrateWeakRandom(Environment env) { // In vulnerable versions, this uses java.util.Random which is predictable String weakSecret = env.getProperty("random.value"); // Attackers can predict this value if they know the startup time System.out.println("Predictable Secret: " + weakSecret); return weakSecret; } }

{"cve": {"id": "CVE-2026-40975", "sourceIdentifier": "[email protected]", "published": "2026-04-28T00:16:24.657", "lastModified": "2026-04-30T13:57:15.473", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Values produced by ${random.value} are not suitable for use as secrets. ${random.uuid} is not affected. ${random.int} and ${random.long} should never be used for secrets as they are numeric values with a predictable range.\n\nAffected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); random value property source / weak PRNG for secrets. Versions that are no longer supported are also affected per vendor advisory."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-330"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.7.33", "matchCriteriaId": "5B1C9BD7-7555-4B3D-AED9-60C3C13DCF46"}, {"vulnerable": true, "criteria": "cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3.0", "versionEndExcluding": "3.3.19", "matchCriteriaId": "28EE6470-24FD-49D1-A2F0-7A19B290A161"}, {"vulnerable": true, "criteria": "cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4.0", "versionEndExcluding": "3.4.16", "matchCriteriaId": "758A9E8F-0C52-43D9-8D84-69622B345A4E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5.0", "versionEndExcluding": "3.5.14", "matchCriteriaId": "D23096A1-8269-46C5-9215-9098E87D0A24"}, {"vulnerable": true, "criteria": "cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0.0", "versionEndExcluding": "4.0.6", "matchCriteriaId": "12A166C5-8B55-4BA3-AA8B-6024A257D441"}]}]}], "references": [{"url": "https://spring.io/security/cve-2026-40975", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}