What is CVE-2026-86398?

CVE-2026-86398 is a high-severity vulnerability in Dell Powerprotect Data Domain, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-10-28.

How severe is CVE-2026-86398?

High severity. CVSS v3 base score is 8.8 out of 10.

Path Traversal in Dell Powerprotect Data Domain

CVE-2026-86398

Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to filesystem access for attacker.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (27.9th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Dell Powerprotect Data Domain

Weakness classification (CWE)

CWE-22 — Path Traversal

References

www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-del… (vendor-advisory)

Frequently asked questions

What is CVE-2026-86398?: CVE-2026-86398 is a high-severity vulnerability in Dell Powerprotect Data Domain, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-10-28.
How severe is CVE-2026-86398?: High severity. CVSS v3 base score is 8.8 out of 10.