EUVD-2026-77889
GHSA-6rwm-g9hc-x4rh
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Local crafted-document processing requires victim interaction (AV:L/UI:R); a read-only OOB leaks limited adjacent memory (C:L, not C:H) and can crash the app (A:H), with no integrity impact.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
An integer overflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Processing a maliciously crafted document may lead to an out-of-bounds read.
AnalysisAI
An integer overflow in Apple macOS document processing can trigger an out-of-bounds read when a user opens a maliciously crafted file, resulting in potential disclosure of adjacent memory contents and/or a crash of the affected application. Affected versions are macOS releases below Golden Gate 27, below Tahoe 26.7, and below Sequoia 15.8; exploitation requires local handling of the crafted document plus mandatory user interaction (the victim must open the file), and no privileges are required per the CVSS vector (PR:N), but there is no remote or network-service exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local processing of a maliciously crafted document by an affected macOS version (below Golden Gate 27, Sequoia 15.8, or Tahoe 26.7) and mandatory user interaction (UI:R) - the victim must open the attacker-supplied file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H, base 7.1) describes a local, user-interaction-dependent flaw: a victim must open a maliciously crafted document. … 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 | Vendor-released patch: update to macOS Golden Gate 27, macOS Tahoe 26.7, or macOS Sequoia 15.8 as applicable, per the Apple advisories at https://support.apple.com/en-us/149035, https://support.apple.com/en-us/149042, and https://support.apple.com/en-us/149043; these are the only confirmed fixed builds. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm which macOS builds are in scope by pulling an inventory of all Apple endpoints and flagging any host below Golden Gate 27, Tahoe 26.7, or Sequoia 15.8, then notify IT and the user community that macOS software updates should be applied immediately; where immediate upgrade is not possible, prioritize the highest-risk users (executives, finance, legal, HR) and remind staff not to open unexpected or unsolicited documents from untrusted sources. …
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External POC / Exploit Code
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