What is CVE-2026-40635?

CVE-2026-40635 is a medium-severity vulnerability in Dell Powerscale Onefs, classified under Insecure Temporary File. CVSS score: 5.4/10. Published 2026-09-09.

How severe is CVE-2026-40635?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Dell Powerscale Onefs

CVE-2026-40635

Dell PowerScale OneFS versions 9.12.0.0 through 9.13.1.0 contain an Insecure Temporary File vulnerability. A low privileged remote attacker could potentially exploit this vulnerability, leading to denial of service and information tampering.

Published 2026-09-09 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (32.0th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-377 — Insecure Temporary File

References

www.dell.com/support/kbdoc/en-us/000505684/dsa-2026-360-security-update-for-del… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40635?: CVE-2026-40635 is a medium-severity vulnerability in Dell Powerscale Onefs, classified under Insecure Temporary File. CVSS score: 5.4/10. Published 2026-09-09.
How severe is CVE-2026-40635?: Medium severity. CVSS v3 base score is 5.4 out of 10.