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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.3.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "macOS", "source": "cna", "vendor": "Apple"}, "product": "macos", "vendor": "apple"}], "analysis": {"en": {"generated_at": "2026-04-13T19:41:54.251240+00:00", "value": {"mitigation_remediation": ["Upgrade Swift Crypto to version 4.3.1 or later"], "summary": {"action": "Immediate Patch", "impact": "Potential Memory Disclosure or Application Crash"}, "threat_synthesis": {"affected_systems": "Apple\u2019s macOS platform is affected because the Swift Crypto library shipped with the OS implements the HPKE algorithm. The flaw is present in all Swift Crypto releases before version 4.3.1; the vendor has fixed the issue in that release. Users of any earlier versions that include Swift Crypto on macOS are therefore impacted.", "description_and_impact": "A vendor\u2011supplied cryptographic library contains an out\u2011of\u2011bounds read in the HPKE decapsulation routine. When a remote caller supplies a specifically crafted short X\u2011Wing HPKE encapsulated key, the C code reads past the bounds of the intended buffer. The result can either be a termination of the application or, if memory protection mechanisms are absent, the disclosure of arbitrary memory contents. The vulnerability is a classic example of CWE\u2011125, where an improper bounds check leads to uncontrolled data exposure.", "risk_and_exploitability": "The CVSS metric for this vulnerability is 7.5, indicating a high severity. The EPSS score is below 1\u202f%, suggesting that exploitation likelihood is low, and CISA has not listed it in its Known Exploited Vulnerabilities catalog. The likely attack vector requires an attacker to provide a maliciously crafted HPKE encapsulation to an application or service that uses Swift Crypto to decapsulate keys. Successful exploitation would result in either an application crash or a memory disclosure, potentially exposing sensitive data if proper isolation protections are not in place."}}}}, "created": "2026-04-03T07:31:13.631132+00:00", "updated": "2026-04-14T16:41:52.845626+00:00", "vendors": ["apple", "apple$PRODUCT$macos"]}