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.NET

CVE-2026-26127 — .NET Denial of Service Vulnerability

Important CVSS 7.5 EPSS 0.02049 📢 Publicly disclosed 2026-03 archive

Executive Summary

Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
Category Denial of Service
Released Mar 10 2026
Last Updated Mar 10 2026
Publicly Disclosed Yes
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.02049 — 0.78726 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

0.02049
probability of exploitation in the next 30 days
0.78726 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
.NET 10.0 installed on Linux 5081276 (Security Update) Important Denial of Service Maybe
.NET 10.0 installed on Mac OS 5081276 (Security Update) Important Denial of Service Maybe
.NET 10.0 installed on Windows 5081276 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Linux 5081278 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Mac OS 5081278 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Windows 5081278 (Security Update) Important Denial of Service Maybe
Microsoft.Bcl.Memory 10.0 (Security Update) Important Denial of Service Maybe
Microsoft.Bcl.Memory 9.0 (Security Update) Important Denial of Service Maybe

Patches

3 patches
Article Type Restart
5081276 Security Update Maybe
5081278 Security Update Maybe
Security Update Maybe

Known Exploits

Acknowledgments

Anonymous

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