CVE-2026-59644

{"id": "CVE-2026-59644", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59644", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-03T13:36:00.578531Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "91579145-5d7b-4cc5-b925-a0262ff19630", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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:Amber", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "AMBER", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "91579145-5d7b-4cc5-b925-a0262ff19630", "affectedData": [{"repo": "https://github.com/bcgit/bc-java", "vendor": "Legion of the Bouncy Castle Inc.", "modules": ["mls"], "product": "BC-JAVA", "versions": [{"status": "affected", "version": "1.73", "lessThan": "1.85", "versionType": "maven"}], "platforms": ["all"], "packageURL": "pkg:maven/org.bouncycastle/bcmls-jdk18on", "packageName": "bcmls", "programFiles": ["GroupKeySet"], "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/", "defaultStatus": "unaffected"}]}], "published": "2026-08-03T01:16:44.467", "references": [{"url": "https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f", "source": "91579145-5d7b-4cc5-b925-a0262ff19630"}, {"url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059644", "source": "91579145-5d7b-4cc5-b925-a0262ff19630"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "91579145-5d7b-4cc5-b925-a0262ff19630", "description": [{"lang": "en", "value": "CWE-834"}]}], "descriptions": [{"lang": "en", "value": "In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender."}], "lastModified": "2026-08-04T14:50:12.360", "sourceIdentifier": "91579145-5d7b-4cc5-b925-a0262ff19630"}