What is CVE-2026-28815?

CVE-2026-28815 is a high-severity vulnerability in Apple Macos, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-04-03.

How severe is CVE-2026-28815?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Apple Macos

CVE-2026-28815

A remote attacker can supply a short X-Wing HPKE encapsulated key and trigger an out-of-bounds read in the C decapsulation path, potentially causing a crash or memory disclosure depending on runtime protections. This issue is fixed in swif…

Vulnerability class: Buffer Overflow

EPSS: 0.005 (38.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Apple Macos — versions 4.0.0
Apple Swift-crypto

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

product-security@apple.com (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28815?: CVE-2026-28815 is a high-severity vulnerability in Apple Macos, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-04-03.
How severe is CVE-2026-28815?: High severity. CVSS v3 base score is 7.5 out of 10.