EUVD-2026-77906
GHSA-g93j-m553-jp8w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable malicious NFS server (AV:N) but the victim must connect/mount it, so UI:R; description supports only kernel crash, hence C:N/I:N/A:H.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious NFS server may cause unexpected system termination or corrupt kernel memory.
AnalysisAI
An out-of-bounds read in the macOS kernel NFS client can terminate the system or corrupt kernel memory when the host connects to a malicious NFS server, and it affects macOS releases before Golden Gate 27, Tahoe 26.7, and Sequoia 15.8. The vendor rates it 7.5 (AV:N/AC:L/PR:N/UI:N), while our assessment adjusts to require user interaction (UI:R) because the victim host must mount or auto-mount an attacker-controlled NFS export - this is a client-side, attacker-server-initiated condition, not a remote hit against a listening service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target macOS host to initiate or accept a connection to an attacker-controlled NFS server (a malicious NFS export the victim mounts or auto-mounts); the malformed server response then triggers the kernel NFS client OOB read. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) rates this an availability-only network flaw, but the description materially constrains that: exploitation requires the victim macOS host to CONNECT TO a malicious NFS server, so this is a client-side, attacker-server-initiated condition rather than a server being attacked. … 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: upgrade to macOS Golden Gate 27, macOS Tahoe 26.7, or macOS Sequoia 15.8 as applicable, following Apple's advisories at https://support.apple.com/en-us/149035, https://support.apple.com/en-us/149042, and https://support.apple.com/en-us/149043; patching the kernel is the only complete fix because the vulnerable parsing runs in privileged context. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all macOS endpoints and flag any running releases older than macOS Golden Gate 27, macOS Tahoe 26.7, and macOS Sequoia 15.8, and while that sweep runs, restrict outbound NFS traffic (TCP/UDP 2049) from endpoints to an approved allowlist of trusted file servers so no unvetted host can satisfy an NFS mount. …
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External POC / Exploit Code
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