CVE-2026-84544Network attack vector

System termination via NFS integer overflow

Published Sep 14, 2026 · Updated Sep 14, 2026

Integer overflow in Apple macOS allows remote attackers running a malicious NFS server to terminate an affected system. The NFS client accepts server-supplied input that triggers an integer overflow because the kernel does not validate the value adequately; Apple has not identified the affected function. A target must connect to an attacker-controlled NFS server; triggering the flaw crashes the system or corrupts kernel memory, with no published code-execution claim.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Apple macOS allows remote attackers running a malicious NFS server to terminate an affected system. The NFS client accepts server-supplied input that triggers an integer overflow because the kernel does not validate the value adequately; Apple has not identified the affected function. A target must connect to an attacker-controlled NFS server; triggering the flaw crashes the system or corrupts kernel memory, with no published code-execution claim.

The record

CVE
CVE-2026-84544
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Apple
Product
macOS
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

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

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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 privilegesunauthenticated

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

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Your stack

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