CVE-2026-11914

Executive Summary

CVE-2026-11914 is a vulnerability reported in the Drupal Composer ecosystem. The official NVD description is minimal, stating only "vulnerability in Drupal Composer allows . This issue affects Composer versions: .." No CVSS score, CWE, or specific technical details have been provided by the vendor or NVD. Enriched hacker intelligence sources (EPSS, OSV, GitHub Advisory) show no data, indicating this CVE may be a placeholder, a reserved ID with no public disclosure, or a vulnerability that has not yet been fully analyzed. The lack of a patch, exploit code, or detection templates suggests that exploitation is not currently observed in the wild.

Supply Chain & Package Security

This vulnerability affects the Drupal Composer ecosystem, which is a critical dependency management tool for Drupal projects. Composer is used to manage PHP packages and their dependencies. A vulnerability in Composer could potentially allow an attacker to compromise the software supply chain by injecting malicious packages, altering dependency resolution, or executing arbitrary code during the build or update process. Given the lack of details, the exact attack vector remains unknown, but supply chain risks are inherent in any package manager vulnerability.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unassigned)
• CVSS Vector: UNKNOWN
• Threat Level: Unknown / Unassigned

Due to the absence of a CVSS score and vector, the severity of this vulnerability cannot be determined. The threat level is currently considered low until more information is disclosed.

Deep Dive & Mechanics

No technical details are available for CVE-2026-11914. The vulnerability is described only as existing in "Drupal Composer" affecting "Composer versions: .". This could indicate a broad range of versions or a placeholder for future disclosure. Without a CWE, exploit code, or proof of concept, the mechanics of the vulnerability cannot be analyzed.

Vulnerable vs. Patched Code

No code comparison is possible as no vulnerable or patched code has been released. The patch status is "None," and no OSV or GitHub advisory data exists.

Exploitation & Lab Setup

No exploit code or proof of concept is available for this CVE. The following sections are provided for general preparedness.

Red Team (Simulated Attack)

Since no exploit exists, a red team exercise would focus on reconnaissance and monitoring for future disclosures. Attackers may attempt to:

• Monitor Drupal security advisories and Composer changelogs for patch releases.
• Scan for outdated Composer versions in Drupal installations.
• Attempt to exploit similar known Composer vulnerabilities (e.g., CVE-2022-24828, CVE-2021-29472) as a proxy.

Blue Team (Defense & Detection)

Blue teams should:

• Ensure all Drupal and Composer installations are updated to the latest stable versions.
• Monitor for unusual Composer activity, such as unexpected package installations or updates.
• Implement integrity checks for Composer lock files and vendor directories.
• Use file integrity monitoring (FIM) to detect unauthorized changes to composer.json or composer.lock.

Indicators of Compromise (IOCs)

No specific IOCs are available for this CVE. General indicators for Composer-related attacks include:

• Unauthorized modifications to composer.json or composer.lock.
• Unexpected packages in the vendor/ directory.
• Outbound connections to suspicious domains during Composer operations.
• Anomalous PHP execution logs during composer install or composer update.

Detection Engineering

No YARA, Sigma, or Suricata rules can be generated due to the lack of technical details. The following are placeholder rules that can be adapted once more information is available.

YARA Rule

rule CVE_2026_11914_Composer_Vuln {
    meta:
        description = "Detect potential exploitation of CVE-2026-11914 in Drupal Composer"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-11914"
    strings:
        $suspicious_package = /composer\.(json|lock).*"require".*"malicious-package"/ nocase
        $composer_anomaly = /composer\.(json|lock).*"type".*"project"/ nocase
    condition:
        any of them
}

Sigma Rule

title: Potential CVE-2026-11914 Exploitation Attempt
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects suspicious Composer activity possibly related to CVE-2026-11914
author: Valters IT
date: 2025-04-10
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/composer'
        CommandLine|contains:
            - 'install'
            - 'update'
            - 'require'
    condition: selection
falsepositives:
    - Legitimate Composer operations
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2026-11914 - Suspicious Composer Download"; flow:to_server; content:"packagist.org"; http_host; content:"/packages/"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate Action: Since no patch is available, monitor Drupal security advisories and the Composer project for updates.
• Mitigation: If the vulnerability is confirmed to affect a specific Composer version, restrict network access for Composer processes and use a private package mirror with strict allowlisting.
• Long-term: Implement a robust software composition analysis (SCA) tool to detect vulnerable dependencies. Regularly update Composer and all Drupal components.

Valters IT
DevSecOps & Cyber Threat Intelligence