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Medium

Stack-based buffer overflow in Dell PowerProtect Data Domain DD OS

IdentifiersCVE-2026-26951CWE-121· Stack-based Buffer Overflow

CVE-2026-26951 is a stack-based buffer overflow vulnerability in Dell PowerProtect Data Domain products running Data Domain Operating System (DD OS), including Dell PowerProtect Data Domain appliances, Data Domain Virtual Edition, and Dell APEX Protection Storage. The provided content states that affected versions include DD OS feature releases 7.7.1.0 through 8.6, LTS2025 releases 8.3.1.0 through 8.3.1.20, and LTS2024 releases 7.13.1.0 through 7.13.1.60. A high-privileged attacker with local access can exploit the flaw to trigger memory corruption on the stack and achieve arbitrary command execution with root privileges.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in arbitrary command execution as root on the affected Data Domain system. This gives the attacker full control over the appliance or virtual instance, enabling compromise of confidentiality, integrity, and availability of protected backup and storage data, as well as potential destruction or manipulation of backup infrastructure.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, limit local access to trusted administrators only, minimize the number of high-privilege accounts, restrict shell or console access, and monitor for suspicious privileged activity on affected systems. Because exploitation requires local access and high privileges, hardening administrative access paths and reducing privileged exposure can lower risk until upgrades are applied.

Remediation

Patch, then assume compromise.

Upgrade affected Dell DD OS installations to a remediated release. The provided content states fixes are available in DD OS 8.6.1.10 and 8.7.0.0 or later for the main feature-release track, 8.3.1.30 or later for LTS2025, and 7.13.1.70 or later for LTS2024. For PowerProtect DP Series Appliance deployments, Dell states issues are remediated in version 2.7.9 with DD OS 8.3.1.30.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Dell TechnologiesData Domain Operating Systemoperating_system
Dell TechnologiesPowerprotect Data Domainapplication
Dell TechnologiesPowerprotect Dp Series Applianceapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-26951
NVD
nvd.nist.gov/vuln/detail/CVE-2026-26951
MITRE CWE · CWE-121
Stack-based Buffer Overflow
Vendor Advisory
dell.com/support/kbdoc/en-us/000450699/dsa-2026-060-security-update-for-dell-powerprotect-data-domain-multiple-vulnerabilities