CVE-2026-46465 Overview
CVE-2026-46465 is a format string vulnerability affecting Dell PowerProtect Data Domain across multiple release branches. The flaw resides in the Dell Data Domain Operating System (DD OS) and stems from improper handling of externally controlled format string input [CWE-134]. An authenticated attacker with high privileges can send crafted input over the network to trigger information disclosure or a denial of service condition. Dell disclosed the issue in security advisory DSA-2026-278, which addresses multiple vulnerabilities in the PowerProtect Data Domain product line.
Critical Impact
Successful exploitation can leak sensitive memory contents from the DD OS process and crash the affected service, disrupting backup and recovery operations.
Affected Products
- Dell PowerProtect Data Domain versions 7.7.1.0 through 8.7
- Dell PowerProtect Data Domain LTS2026 versions 8.6.1.0 through 8.6.1.10, and LTS2025 versions 8.3.1.0 through 8.3.1.30
- Dell PowerProtect Data Domain LTS2024 versions 7.13.1.0 through 7.13.1.70
Discovery Timeline
- 2026-07-03 - CVE-2026-46465 published to NVD
- 2026-07-08 - Last updated in NVD database
Technical Details for CVE-2026-46465
Vulnerability Analysis
CVE-2026-46465 is classified as an externally controlled format string vulnerability [CWE-134] in the Dell Data Domain Operating System. Format string flaws occur when user-supplied input is passed directly as the format specifier argument to functions in the printf family, rather than as a data argument. When an attacker controls this input, they can inject conversion specifiers such as %s, %x, or %n to read process memory or corrupt program state.
The vulnerability affects the network-accessible management surface of DD OS. Because the attack vector is network-based, an authenticated administrator or operator account with high privileges can reach the vulnerable code path remotely.
Root Cause
The root cause is the passing of externally influenced strings to formatted output functions without sanitization. In C-based system software, this pattern allows format specifiers embedded in attacker input to be interpreted by the runtime. Read specifiers can walk the stack and disclose adjacent memory, while malformed specifiers can trigger invalid memory accesses that abort the process.
Attack Vector
Exploitation requires authenticated access with high privileges to the Data Domain management interface. An attacker submits a crafted string containing format specifiers to a vulnerable input field or API parameter. The DD OS process interprets the specifiers, either returning leaked memory in error output or crashing the service. Full technical detail is not published; consult the Dell Security Update DSA-2026-278 for vendor-supplied specifics.
Detection Methods for CVE-2026-46465
Indicators of Compromise
- Unexpected crashes or restarts of DD OS management services on PowerProtect Data Domain appliances.
- Administrative API or CLI requests containing format specifier sequences such as %s, %x, %n, or repeated %p patterns.
- Anomalous authenticated sessions from high-privileged accounts originating from unusual source IPs or at unusual times.
Detection Strategies
- Enable and centralize DD OS audit and system logs to capture command inputs and service restart events for review.
- Inspect management-plane traffic for input fields containing printf-style conversion specifiers using an intrusion detection system or WAF signature.
- Correlate privileged account activity with process crash events to identify probing attempts.
Monitoring Recommendations
- Forward DD OS syslog output to a centralized logging or SIEM platform for retention and query.
- Alert on repeated authentication failures followed by successful high-privilege logins to the appliance.
- Track configuration and account changes on Data Domain systems as part of routine backup infrastructure monitoring.
How to Mitigate CVE-2026-46465
Immediate Actions Required
- Apply the fixed DD OS release identified in Dell advisory DSA-2026-278 for your specific LTS or mainline branch.
- Restrict network access to the Data Domain management interface to a dedicated administrative network or jump host.
- Audit and reduce the number of high-privileged accounts on affected appliances, rotating credentials for any account that may have been exposed.
Patch Information
Dell has released fixed versions across each supported branch. Refer to the Dell Security Update DSA-2026-278 for the exact fixed version corresponding to each affected release: 7.7.1.0 through 8.7, LTS2026 8.6.1.0 through 8.6.1.10, LTS2025 8.3.1.0 through 8.3.1.30, and LTS2024 7.13.1.0 through 7.13.1.70.
Workarounds
- Limit access to the DD OS management plane using network access control lists until patching is complete.
- Enforce multi-factor authentication on all administrative accounts to reduce the risk of privileged credential misuse.
- Monitor privileged sessions closely and review command history for suspicious format specifier input while awaiting patch deployment.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
