# CVE-2026-40635: Dell PowerScale OneFS insecure temporary file vulnerability

Source: https://junglewise.ai/threats/cve-2026-40635-dell-powerscale-onefs-insecure-temporary-file-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-09. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-40635 · Severity: medium · CVSS 5.4 · Published 2026-09-09

Dell PowerScale OneFS is a unified file storage and data management system used by enterprises to handle large-scale data operations. CVE-2026-40635 is an insecure temporary file vulnerability that allows a low-privilege attacker with network access to cause service denial and tamper with stored information, potentially disrupting business operations and compromising data integrity.

Technologies: [Dell PowerScale OneFS](https://junglewise.ai/threats/technologies/powerscale-onefs). Vendors: [Dell](https://junglewise.ai/threats/vendors/dell).

## Quick answers

**Is CVE-2026-40635 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40635 being exploited in the wild.

**How severe is CVE-2026-40635?** Medium severity, with a CVSS score of 5.4, published 9 September 2026.

**Which products and versions are affected?** Dell PowerScale OneFS 9.12.0.0 through 9.13.1.0.

**Is there a fix for CVE-2026-40635?** A patch was published on 2026-09-09: Version 9.13.1.1 or later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-40635 attacked?** It is in a network appliance.

**Am I affected by CVE-2026-40635?** Check whether you run Dell PowerScale OneFS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

CVE-2026-40635 is an insecure temporary file vulnerability in Dell PowerScale OneFS versions 9.12.0.0 through 9.13.1.0. The vulnerability can be exploited by a low-privileged remote attacker over the network without user interaction, requiring only valid credentials (PR:L). Exploitation leads to denial of service (availability impact) and information tampering (integrity impact). Patches are available in version 9.13.1.1 or later according to the remediation guidance.

## Affected products

- Dell PowerScale OneFS 9.12.0.0 through 9.13.1.0

## Timeline

- 2026-09-09: disclosed
- 2026-09-09: patched: Version 9.13.1.1 or later

## References

- [https://www.dell.com/support/kbdoc/en-us/000505684/dsa-2026-360-security-update-for-dell-powerscale-onefs-multiple-vulnerabilities](https://www.dell.com/support/kbdoc/en-us/000505684/dsa-2026-360-security-update-for-dell-powerscale-onefs-multiple-vulnerabilities)

## Related threats

- [Dell PowerScale OneFS command injection privilege escalation](https://junglewise.ai/threats/cve-2026-70425-dell-powerscale-onefs-command-injection-privilege-escalation)
- [Dell PowerScale OneFS incorrect authorization in system logs](https://junglewise.ai/threats/cve-2026-46460-dell-powerscale-onefs-incorrect-authorization-in-system-logs)
- [Dell PowerScale OneFS sensitive information disclosure in log files](https://junglewise.ai/threats/cve-2026-40633-dell-powerscale-onefs-sensitive-information-disclosure-in-log)
- [Dell PowerScale OneFS privilege escalation](https://junglewise.ai/threats/cve-2026-49501-dell-powerscale-onefs-privilege-escalation)
- [Dell PowerScale OneFS versions 9.5.0.0 through 9.5.1.6, 9.6.0.0 through 9.7.1.13, 9.8.0.0 through 9.10.1.5 and…](https://junglewise.ai/threats/cve-2026-32803-dell-powerscale-onefs-versions-9-5-0-0-through-9-5-1-6-9-6-0-0)