CVE-2026-84549Network attack vector

System crash via NFS out-of-bounds read

Published Sep 14, 2026 · Updated Sep 14, 2026

An out-of-bounds read in the macOS kernel before 15.8, 26.7, and 27 allows remote attackers to crash the system via a malicious NFS server. The kernel's NFS client reads beyond a buffer boundary because it does not adequately validate server-supplied data before accessing memory. A Mac must connect to an attacker-controlled NFS server; successful exploitation causes unexpected system termination or corrupts kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An out-of-bounds read in the macOS kernel before 15.8, 26.7, and 27 allows remote attackers to crash the system via a malicious NFS server. The kernel's NFS client reads beyond a buffer boundary because it does not adequately validate server-supplied data before accessing memory. A Mac must connect to an attacker-controlled NFS server; successful exploitation causes unexpected system termination or corrupts kernel memory.

The record

CVE
CVE-2026-84549
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Apple
Product
macOS
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <15.8
  2. Affected versionversion=0 <26.7
  3. Affected versionversion=0 <27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Apple · macOSversion=0 <15.8; version=0 <26.7; version=0 <27

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo