High severity · published May 12, 2026
CVE-2026-42899
ASP.NET Core Denial of Service Vulnerability
7.5
CVSS
2.4%
EPSS
No
On KEV
Description
Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.4% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N1
.NET 10.0 · Microsoft
10.0.0 before 10.0.8 · source: vendor
N8
.NET 8.0 · Microsoft
8.0.0 before 8.0.27 · source: vendor
N9
.NET 9.0 · Microsoft
9.0.0 before 9.0.16 · source: vendor
NE
.net · Microsoft
8.0.0 before 8.0.27; 9.0.0 before 9.0.16; 10.0.0 before 10.0.8 · source: NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9.6 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42899
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42899
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:17464
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:17527
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:17682
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:21286
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:21291
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