CVE-2026-26171 Vulnerability Analysis & Exploit Details

CVE-2026-26171
Vulnerability Scoring

7.5
/10
Very High Risk

Highly exploitable, CVE-2026-26171 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-26171 Details

Status: Analyzed

Last updated: 🕢 07 May 2026, 19:42 UTC
Originally published on: 🕕 14 Apr 2026, 18:16 UTC

Time between publication and last update: 23 days

CVSS Release: version 3

CVSS3 Source

secure@microsoft.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-26171 Vulnerability Summary

CVE-2026-26171: Uncontrolled resource consumption in .NET allows an unauthorized attacker to deny service over a network.

Assessing the Risk of CVE-2026-26171

Access Complexity Graph

The exploitability of CVE-2026-26171 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-26171

With low attack complexity and no required privileges, CVE-2026-26171 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-26171, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-26171, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-26171 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-26171 poses no threat to data integrity.
  • Availability: High
    CVE-2026-26171 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-26171 References

External References

CWE Common Weakness Enumeration

CWE-611

CAPEC Common Attack Pattern Enumeration and Classification

  • Data Serialization External Entities Blowup CAPEC-221 This attack takes advantage of the entity replacement property of certain data serialization languages (e.g., XML, YAML, etc.) where the value of the replacement is a URI. A well-crafted file could have the entity refer to a URI that consumes a large amount of resources to create a denial of service condition. This can cause the system to either freeze, crash, or execute arbitrary code depending on the URI.

Vulnerable Configurations

  • cpe:2.3:a:microsoft:.net:10.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.1:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.1:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.2:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.2:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.3:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.3:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.4:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.4:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.5:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.5:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.6:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.6:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.0:preview.7:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.0:preview.7:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:10.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:10.0.3:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
    cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.1:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.1:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.2:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.2:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.3:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.3:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.4:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.4:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.5:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.5:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.6:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.6:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.0:preview.7:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.0:preview.7:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.8:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.9:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.10:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.10:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.11:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.11:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.12:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.12:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.13:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.13:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.14:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.14:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.15:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.15:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.16:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.16:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.17:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.17:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.18:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.18:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.19:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.19:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.20:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.20:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.21:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.21:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.22:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.22:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.23:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.23:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:8.0.24:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:8.0.24:*:*:*:*:*:*:*
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
    cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.8:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.9:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.10:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.10:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.11:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.11:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.12:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.12:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:.net:9.0.13:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:.net:9.0.13:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:powershell:7.5:-:*:*:*:*:*:*
    cpe:2.3:a:microsoft:powershell:7.5:-:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:powershell:7.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:powershell:7.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:powershell:7.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:powershell:7.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:powershell:7.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:powershell:7.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:powershell:7.5.4:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:powershell:7.5.4:*:*:*:*:*:*:*

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