CVE-2026-41013
SMB Volume Mount Option Injection in CloudFoundry Diego
Publication date: 2026-06-01
Last updated on: 2026-06-01
Assigner: VMware
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cloud_foundry | smb_volume_release | to 3.60.0 (exc) |
| cloud_foundry | cf_deployment | to 56.0.0 (exc) |
| vmware | smb-volume-release | to 3.60.0 (exc) |
| vmware | cf_deployment | to 56.0.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-88 | The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-41013 is a high-severity vulnerability in Cloud Foundry's SMB volume mount handling within the diego-release component. It allows low-privileged Cloud Foundry space developers to bypass input validation by exploiting a comma smuggling technique, which lets them inject arbitrary CIFS mount options.
This bypass circumvents the intended allowlist designed to restrict dangerous mount operations on shared Diego infrastructure. As a result, attackers can manipulate mount options to weaken security settings, alter credentials, override security protocols, or apply other forbidden configurations.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
This vulnerability enables low-privileged developers to bypass security controls and escalate privileges on multi-tenant Diego cells by injecting arbitrary CIFS mount options. Such unauthorized access and privilege escalation can lead to compromise of data confidentiality and integrity.
As a result, organizations using affected versions may face increased risk of unauthorized data access or modification, which could impact compliance with data protection regulations like GDPR and HIPAA that require strict access controls and protection of sensitive information.
Mitigating this vulnerability by upgrading or applying recommended workarounds is essential to maintain compliance with these standards.
How can this vulnerability impact me? :
Exploiting this vulnerability can lead to privilege escalation, unauthorized filesystem access, and compromise of the multi-tenant security model on Diego cells.
- Attackers can weaken security by enabling dangerous mount options such as setuids, noperm, and nounix.
- They can alter credentials used for mounting by specifying custom credential paths or user IDs.
- Security protocols can be overridden, potentially bypassing authentication or encryption mechanisms.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
Detection of this vulnerability involves auditing existing SMB volume mounts on Diego cells to identify any mounts with suspicious or unauthorized CIFS mount options that bypass the allowlist.
Look for mount options that include potentially dangerous flags such as setuids, noperm, nounix, or options that override credentials or security protocols like cruid=, credentials=, or sec=.
Commands to help detect such mounts could include inspecting mounted filesystems on Diego cells using standard Linux commands such as:
- mount | grep cifs
- cat /proc/mounts | grep cifs
Review the output for any mount options that are not part of the allowed list or that include suspicious parameters indicating an injection of arbitrary CIFS mount options.
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include upgrading affected components to fixed versions: smb-volume-release to v3.60.0 or later, and CF Deployment to v56.0.0 or later.
If upgrading is not immediately possible, apply workarounds such as:
- Disabling SMB volume mounting for space developers to prevent exploitation.
- Restricting SMB operations to platform operators only.
- Auditing existing SMB mounts for suspicious or unauthorized mount options.
- Implementing network-level controls around Diego cells to limit exposure.