What is CVE-2026-42899?

CVE-2026-42899 is a high-severity vulnerability in Apple Macos, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-05-12.

How severe is CVE-2026-42899?

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

Vulnerability in Apple Macos

CVE-2026-42899

Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

EPSS: 0.000 (11.0th 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
Linux Linux_kernel
Microsoft .Net
Microsoft .Net 10.0 — versions 10.0.0
Microsoft .Net 8.0 — versions 8.0.0
Microsoft .Net 9.0 — versions 9.0.0
Microsoft Windows

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

ASP.NET Core Denial of Service Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42899?: CVE-2026-42899 is a high-severity vulnerability in Apple Macos, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-05-12.
How severe is CVE-2026-42899?: High severity. CVSS v3 base score is 7.5 out of 10.