# CVE-2026-86377: Dell PowerProtect Data Domain out-of-bounds write

Source: https://junglewise.ai/threats/cve-2026-86377-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-86377 · Severity: high · CVSS 7.6 · Published 2026-10-28

Dell PowerProtect Data Domain is a data storage and deduplication appliance used by enterprises to back up and protect critical business data. An out-of-bounds write vulnerability allows a remote attacker with low privileges to cause a denial of service, disrupting backup and recovery operations across the organization.

Technologies: [Dell PowerProtect Data Domain](https://junglewise.ai/threats/technologies/powerprotect-data-domain). Vendors: [Dell](https://junglewise.ai/threats/vendors/dell).

## Quick answers

**Is CVE-2026-86377 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86377 being exploited in the wild.

**How severe is CVE-2026-86377?** High severity, with a CVSS score of 7.6, published 28 October 2026.

**Which products and versions are affected?** Dell PowerProtect Data Domain Feature Release 7.7.1.0–8.8, LTS2024 7.13.1.0–7.13.1.80, LTS2025 8.3.1.0–8.3.1.40, LTS2026 8.6.1.0–8.6.1.20.

**Is there a fix for CVE-2026-86377?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-86377 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-86377?** Check whether you run Dell PowerProtect Data Domain at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds write vulnerability in Dell PowerProtect Data Domain allows a remote, low-privileged attacker to write beyond allocated buffer boundaries. Successful exploitation results in denial of service by corrupting memory and crashing the affected service. The vulnerability requires network access and valid (low-privilege) authentication.

## Affected products

- Dell PowerProtect Data Domain Feature Release 7.7.1.0–8.8, LTS2024 7.13.1.0–7.13.1.80, LTS2025 8.3.1.0–8.3.1.40, LTS2026 8.6.1.0–8.6.1.20

## Timeline

- 2026-10-28: disclosed

## References

- [https://www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-dell-powerprotect-data-domain-multiple-vulnerabilities](https://www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-dell-powerprotect-data-domain-multiple-vulnerabilities)

## Related threats

- [Dell PowerProtect Data Domain stack buffer overflow](https://junglewise.ai/threats/cve-2026-86378-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0)
- [Dell PowerProtect Data Domain OS command injection](https://junglewise.ai/threats/cve-2026-110541-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0)
- [Dell PowerProtect Data Domain stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-103780-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0)
- [Dell PowerProtect Data Domain improper authentication](https://junglewise.ai/threats/cve-2026-103779-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0)
- [Dell PowerProtect Data Domain resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-92665-dell-powerprotect-data-domain-feature-release-versions-7-7-1-0)