CVE-2026-113943: An out-of-bounds write issue was addressed with improved bounds checking

Routine

MEDIUM 6.5MITIGATE

CVE-2026-113943 is a medium-severity flaw (CVSS 6.5) affecting macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27.2. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-10-26
Last modified	2026-10-28

Publisher (CNA): Apple Inc. · Vendor: apple

Last updated 2026-10-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-26 21:18 UTCPublished CVE record published
2026-10-28 19:03 UTCUpdated Record last modified

apple macos MITIGATE

Affected: 27.0 · 27.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 27.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-113943?

macos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-113943 being exploited?

CVE-2026-113943 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-113943 affect?

CVE-2026-113943 affects macos. Severity is medium (CVSS 6.5). An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27.2. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.

How urgent is CVE-2026-113943?

Priority 32/100. No elevated risk signals yet.

Software pages

macOS vulnerabilities

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References

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