CVE-2026-40635: Dell PowerScale OneFS versions 9.12.0.0 through 9.13.1.0 contain an Insecure Temporary File vulnerability

Q: How do I fix CVE-2026-40635?

powerscale onefs: upgrade to newer than 9.13.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40635 being exploited?

CVE-2026-40635 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40635 affect?

CVE-2026-40635 affects powerscale onefs. Severity is medium (CVSS 5.4). 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

Q: How urgent is CVE-2026-40635?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-40635 is a medium-severity flaw (CVSS 5.4) affecting powerscale onefs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-377
Published	2026-09-09
Last modified	2026-09-16

Publisher (CNA): Dell · Vendor: dell

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-09 17:17 UTCPublished CVE record published
2026-09-16 15:30 UTCUpdated Record last modified

dell powerscale onefs UPGRADE

Affected: >= 9.12.0.0 and <= 9.13.1.0

Fixed in: newer than 9.13.1.0

Safe to downgrade to: a release before 9.12.0.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40635?

powerscale onefs: upgrade to newer than 9.13.1.0. Exact commands for each OS are on this page.

Is CVE-2026-40635 being exploited?

CVE-2026-40635 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40635 affect?

CVE-2026-40635 affects powerscale onefs. Severity is medium (CVSS 5.4). 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

How urgent is CVE-2026-40635?

Priority 27/100. No elevated risk signals yet.

Software pages

Dell vulnerabilities

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References

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