What is the CVSS score of CVE-2026-29042?

CVE-2026-29042 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.7%.

Is there a public PoC exploit available for CVE-2026-29042?

Yes, a public proof-of-concept exploit is available for CVE-2026-29042. Prioritise patching immediately. EPSS: 0.7%.

How to fix or mitigate CVE-2026-29042?

Within 24 hours: Identify all systems running Nuclio versions prior to 1.15.20 and isolate them from production networks if patching cannot be completed immediately. Within 7 days: Apply vendor patch to upgrade all affected Nuclio instances to version 1.15.20 or later, with testing in non-production environments first. Within 30 days: Conduct forensic analysis of patched systems for signs of compromise, review access logs for suspicious activity, and implement monitoring for command injection attack patterns.

Nuclio CVE-2026-29042

CRITICAL

Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) (CWE-75)

2026-03-06 security-advisories@github.com

GHSA-95fj-3w7g-4r27

Command Injection AI / ML Nuclio Suse

9.8

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

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

Access

Send HTTP request with malicious X-Nuclio-Arguments header
Exploit

Runtime incorporates header value into shell command
Execution

Execute arbitrary shell commands
Impact

Achieve remote code execution

Vulnerability Assessment

Weakness	CWE CWE-75 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V1 - Encoding and Sanitization Failure to sanitize special elements
Exploitation Conditions	Nuclio Shell Runtime versions prior to 1.15.20 with HTTP function invocation enabled. Attacker must send HTTP request to vulnerable function endpoint with crafted X-Nuclio-Arguments header containing shell metacharacters.
Impact	CVSS 9.8, EPSS 0.69%.
Exploit ScenarioDerived	Inject commands through serverless function deployment.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 0.7% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Shell command injection in Nuclio serverless framework before 1.15.20. PoC and patch available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.8

Shell injection in Nuclio serverless platform.

RemediationAI

Update.

Affected Packages

go github.com/nuclio/nuclio fix: 1.15.20

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

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

Technical ContextAI · show details

CWE-75.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.8 CRITICAL

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

SUSE CRITICAL

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 10, 2026 - 19:32 vuln.today

Public exploit code

Patch released

Mar 10, 2026 - 19:32 nvd

Patch available

CVE Published

Mar 06, 2026 - 07:16 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

Nuclio is a "Serverless" framework for Real-Time Events and Data Processing. Prior to version 1.15.20, the Nuclio Shell Runtime component contains a command injection vulnerability in how it processes user-supplied arguments. When a function is invoked via HTTP, the runtime reads the X-Nuclio-Arguments header and directly incorporates its value into shell commands without any validation or sanitization. This issue has been patched in version 1.15.20.

Executive ViewAI

Why It Matters

Nuclio Shell Runtime versions prior to 1.15.20 contain a critical command injection vulnerability (CVSS 9.8) that allows attackers to execute arbitrary code on affected systems. Organizations using Nuclio for serverless data processing face immediate risk of complete system compromise, data exfiltration, and operational disruption, particularly given the 0.7% EPSS indicates active exploitation is likely.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: disable Nuclio Shell Runtime components, restrict network access to Nuclio endpoints via firewall/WAF rules allowing only trusted sources, implement input validation and sanitization at application layer, disable user-supplied argument processing until patch is applied, and enable enhanced logging and alerting on command execution attempts.

Threat Intelligence Overview

EPSS Score

0.7%

Top 28% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.7%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

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.