Impacts Dell PowerProtect Data Domain, a widely deployed enterprise backup/storage appliance; successful exploit risks backup compromise and operational disruption.
CVE-2026-86378
Stack buffer overflow in Dell PowerProtect Data Domain allowing remote compromise.
Is CVE-2026-86378 being exploited?
Not confirmed. CVE-2026-86378 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-86378?
CVE-2026-86378 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-86378?
Yes. A fix has been recorded for CVE-2026-86378. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-86378 affect?
CVE-2026-86378 affects Dell PowerProtect Data Domain Feature Release 7.7.1.0 through 8.8, LTS2024 7.13.1.0 through 7.13.1.80, LTS2025 8.3.1.0 through 8.3.1.40, LTS2026 8.6.1.0 through 8.6.1.20. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-86378?
Apply Dell security update immediately; isolate affected appliances and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Low-privileged remote attacker can trigger a stack overflow to achieve code execution, escalate privileges, and access/modify backup data.
Immediate action required
- affected< 8.9.0.0 or later
- affected< 7.13.1.90 or later
- affected< 8.3.1.50 or later
- affected< 8.6.1.30 or later
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.