What is CVE-2022-26723?

CVE-2022-26723 is a critical-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-05-26.

How severe is CVE-2022-26723?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2022-26723 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple macOS

CVE-2022-26723

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Monterey 12.4, macOS Big Sur 11.6.6. Mounting a maliciously crafted Samba network share may lead to arbitrary code execution.

Vulnerability class: Buffer Overflow

Published 2022-05-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (72.3th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: +0.000

Affected products

Apple macOS — versions unspecified

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

felix-pb/remote_

References

support.apple.com/en-us/HT213256 (Vendor Advisory)
support.apple.com/en-us/HT213257 (Vendor Advisory)

Frequently asked questions

What is CVE-2022-26723?: CVE-2022-26723 is a critical-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-05-26.
How severe is CVE-2022-26723?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2022-26723 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.