What is CVE-2026-86378?

CVE-2026-86378 is a high-severity vulnerability in Dell Powerprotect Data Domain, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-10-28.

How severe is CVE-2026-86378?

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

Buffer overflow in Dell Powerprotect Data Domain

CVE-2026-86378

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 a Stack-based Buffer Overflow vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to unauthorized access.

Vulnerability class: Buffer Overflow

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Dell Powerprotect Data Domain

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-86378?: CVE-2026-86378 is a high-severity vulnerability in Dell Powerprotect Data Domain, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-10-28.
How severe is CVE-2026-86378?: High severity. CVSS v3 base score is 8.8 out of 10.