What is CVE-2026-45491?

CVE-2026-45491 is a medium-severity vulnerability in Apple macOS, classified under Improper Link Resolution Before File Access. CVSS score: 6.2/10. Published 2026-06-09.

How severe is CVE-2026-45491?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Apple macOS

CVE-2026-45491

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Published 2026-06-09 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000

Affected products

Apple macOS
Linux Kernel
Microsoft .Net
Microsoft .Net 10.0 — versions 10.0.0
Microsoft .Net 8.0 — versions 8.0, 8.0.0
Microsoft .Net 9.0 — versions 9.0.0
Microsoft Windows

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

.NET Tampering Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45491?: CVE-2026-45491 is a medium-severity vulnerability in Apple macOS, classified under Improper Link Resolution Before File Access. CVSS score: 6.2/10. Published 2026-06-09.
How severe is CVE-2026-45491?: Medium severity. CVSS v3 base score is 6.2 out of 10.