CVE-2026-42899

High

Published: 12 May 2026

Published

12 May 2026

Modified

13 May 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score 0.0004 11.8th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-42899 is a high-severity Infinite Loop (CWE-835) vulnerability in Microsoft .Net. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 11.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

Threat & Defense Details

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-835

Enables transfer to alternate site if an infinite loop at the primary renders processing unavailable.

addresses: CWE-835

Detects and mitigates infinite loops that produce sustained resource consumption.

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

Deeper analysisAI

Automated synthesis unavailable for this CVE.

microsoft

.net

8.0.0 — 8.0.27 · 9.0.0 — 9.0.16 · 10.0.0 — 10.0.8