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{"analysis": {"en": {"generated_at": "2026-04-28T18:43:43.547302+00:00", "value": {"mitigation_remediation": ["Upgrade macOS to Sequoia 15.6 or a later release that includes the improved bounds checking fix", "Deploy the latest macOS update to all end\u2011points, including servers and workstations, to eliminate the out\u2011of\u2011bounds write issue", "Where possible, use application sandboxing or restrict the execution of untrusted applications to reduce the chance of local code execution triggering the vulnerability"], "summary": {"action": "Patch immediately", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Apple\u2019s macOS platform is affected, with versions released prior to macOS Sequoia 15.6 carrying the vulnerability. The fix incorporates improved bounds checking and is available in Sequoia 15.6 and later releases, so any older macOS distribution remains at risk.", "description_and_impact": "An out-of-bounds write flaw has been identified in macOS, caused by inadequate bounds checking that could allow a malicious application to write outside the intended memory area. This type of memory corruption can lead to arbitrary memory damage and results in the operating system terminating unexpectedly, representing a denial\u2011of\u2011service condition. The weakness is classified as CWE\u2011787, reflecting a violation of proper bounds validation when accessing memory objects.", "risk_and_exploitability": "The CVSS score of 9.8 indicates a critical severity, while the EPSS score of less than 1\u202f% suggests a low predicted exploitation probability at present. The vulnerability is not listed in the CISA KEV catalog. Based on the description, it is inferred that an attacker would need to run a malicious application on the target machine to trigger the out-of-bounds write, implying a local execution requirement. The risk therefore primarily applies to environments where untrusted or elevated applications can run on macOS systems."}}}}, "created": "2025-07-30T10:14:05.267488+00:00", "title": "macOS Out\u2011of\u2011Bounds Write Causes Unexpected System Termination", "updated": "2026-04-28T18:45:15.984756+00:00", "vendors": ["apple", "apple$PRODUCT$macos", "apple$PRODUCT$macos_sequoia"]}