High severity · published Mar 10, 2026
CVE-2026-26127
.NET Denial of Service Vulnerability
7.5
CVSS
2.1%
EPSS
No
On KEV
Description
Out-of-bounds read in .NET 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)2.1% · higher than 82% 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 10.0.4 · source: vendor
N9
.NET 9.0 · Microsoft
9.0.0 before 9.0.14 · source: vendor
MI
Microsoft.Bcl.Memory · Microsoft
10.0.0 before 10.0.4; 9.0.0 before 9.0.14 · source: vendor
NE
.net · Microsoft
10.0.0 before 10.0.4; 9.0.0 before 9.0.14 · source: NVD
BC
Bcl.memory · Microsoft
9.0.0 before 9.0.14; 10.0.0 before 10.0.4 · source: NVD
In the news
VulnerabilityHigh
Microsoft patches 80+ vulnerabilities, six flagged as “more likely” to be exploited
On March 2026 Patch Tuesday, Microsoft addressed 80+ vulnerabilities affecting its software and cloud services. Of these, two were publicly disclosed, but not actively exploited. Privilege escalation vulnerabilities abound The two publicly disclosed flaws are CVE-2026-21262, a vulnerability in SQL Server that may allow attackers to gain SQLAdmin privileges, and CVE-2026-26127, a .NET flaw that can be triggered for a denial of service attack. The former is “less likely” to be exploited, and the latter … More →
The post Microsoft patches 80+ vulnerabilities, six flagged as “more likely” to be exploited appeared first on Help Net Security .
Mar 11, 2026·Help Net Security
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26127
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26127
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26127
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