What is the CVSS score of CVE-2026-26127?

CVE-2026-26127 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-26127?

Yes, a public proof-of-concept exploit is available for CVE-2026-26127. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26127?

Within 24 hours: Inventory all .NET deployments and identify affected versions using your CMDB and vulnerability scanner. Within 7 days: Deploy the available patch to non-production environments for testing and validation. Within 30 days: Complete patching of all production .NET systems with change management approval and maintain audit trail of deployment.

Net CVE-2026-26127

HIGH

Out-of-bounds Read (CWE-125)

2026-03-10 secure@microsoft.com

GHSA-73j8-2gch-69rq

Buffer Overflow Information Disclosure Microsoft Red Hat Suse Net Bcl Memory

7.5

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send malicious network request to .NET application
Exploit

Trigger out-of-bounds read in memory parsing
Impact

Cause denial of service via crash

Vulnerability Assessment

Weakness	CWE CWE-125 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, read limits MITRE ATT&CK 1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	No special conditions — remote unauthenticated exploitation against default .NET configurations accepting network requests without authentication.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Exploitable via remote/network.
Exploit ScenarioDerived	A remote attacker without authentication could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network. [CVSS 7.5 HIGH]

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

Affected Packages

nuget microsoft.bcl.memory fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-arm fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-arm64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-arm fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-arm64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-x64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.linux-x64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.osx-arm64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.osx-x64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.win-arm fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.win-arm64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.win-x64 fix: 9.0.14, 10.0.4

nuget microsoft.netcore.app.runtime.win-x86 fix: 9.0.14, 10.0.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 13 packages in nuget

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-125 (Out-of-bounds Read). Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SUSE HIGH

Red Hat 7.5 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

PoC Detected

Apr 01, 2026 - 20:22 vuln.today

Public exploit code

Patch released

Apr 01, 2026 - 20:22 nvd

Patch available

CVE Published

Mar 10, 2026 - 18:18 nvd

HIGH 7.5

DescriptionCVE.org

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

Executive ViewAI

Why It Matters

A high-severity vulnerability in .NET could allow attackers to disrupt service availability for any organization running affected .NET applications. This network-accessible denial-of-service flaw poses immediate risk to business continuity and customer-facing services.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 88% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.