How broadly exploitable is this vulnerability in a Kubernetes cluster?

Exploitability depends on whether the cluster uses Flannel's experimental Extension backend and whether an attacker can modify Node annotations. In environments where RBAC is strict and the Extension backend is disabled, the practical risk is significantly reduced.

What level of access does an attacker need to exploit this issue?

An attacker must be able to create or change Kubernetes Node annotations, specifically the `flannel.alpha.coreos.com/backend-data` annotation. This usually requires elevated cluster permissions, a misconfigured controller, or compromise of a privileged identity.

What is the safest general fix pattern for this kind of vulnerability?

The safest pattern is to avoid constructing shell commands from untrusted data altogether. Use non-shell execution mechanisms, pass data as parameters rather than interpolated strings, and enforce strict validation and allowlists on any inputs that influence command behavior.

Severity:

HIGH RISK

(7.5)

Command Injection (CWE-77) in Flannel Extension Backend Node Annotation Handling

CVE-2026-32241

Published:

Mar 27, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Command Injection

CWE:

CWE-77

Impact:

Remote Code Execution with Root Privileges on Flannel Nodes

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Command Injection

CWE:

CWE-77

Impact:

Remote Code Execution with Root Privileges on Flannel Nodes

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Command Injection (CWE-77) in Flannel Extension Backend Node Annotation Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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