EUVD-2026-77997
GHSA-ggcw-m5qm-2p57
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Advisory says 'local attacker' so AV:L and likely PR:L for running local code; kernel memory corruption gives I:H/A:H, and no disclosure is described so C:N.
Primary rating from Vendor (apple).
CVSS VectorVendor: apple
Lifecycle Timeline
6DescriptionCVE.org
A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Golden Gate 27. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.
AnalysisAI
Kernel memory corruption in Apple macOS versions prior to Golden Gate 27 allows a local attacker who can already execute code on the device to trigger an out-of-bounds buffer write, causing unexpected system termination or corruption of kernel memory. Apple addressed the flaw through improved size validation in macOS Golden Gate 27, and a vendor patch is available; no public exploit code has been identified and EPSS remains very low at 0.14% (4th percentile), suggesting limited near-term exploitation activity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires local access to a macOS device running a version before Golden Gate 27 - the attacker must already be able to execute code on the system (e.g., a locally installed/malicious application or an authenticated local user). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS of 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H) directly CONFLICTS with the Apple advisory text, which states 'A local attacker may be able to cause unexpected system termination or corrupt kernel memory.' The description supports a LOCAL vector (AV:L), not network (AV:N) - verify with vendor; the 9.8 appears to be boilerplate inflation, a pattern common across Apple's 2026 kernel-corruption CVEs. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade affected systems to macOS Golden Gate 27, the release in which Apple states the issue is fixed through improved size validation; the vendor advisory at https://support.apple.com/en-us/149035 documents the patch and is the authoritative source for build-level details, and patch availability is confirmed by the vendor. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Mac devices and identify those running macOS versions prior to Golden Gate 27, prioritizing systems with sensitive data or high privilege access. …
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External POC / Exploit Code
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