WinMagic
Security Advisory
CVE-2026-105482 — Hostname Truncation at NUL Byte in dns.resolve
Reference: KB-SEC-2026-1028-06 | Published: October 28, 2026 | Status: Not Affected
Applies to: SecureDoc Client, SES Console, SESWeb (all versions)
Third-party component affected: Node.js | Severity: High
Executive summary
WinMagic is aware of CVE-2026-105482 (Hostname Truncation at NUL Byte in dns.resolve), a vulnerability affecting Node.js. WinMagic has reviewed this CVE against SecureDoc Client, the SES Console and SESWeb. None of these products is affected, for the reason given below. No remediation, patch, or configuration change is required in response to this CVE.
Vulnerability details
CVE ID | CVE-2026-105482 |
Title | Hostname Truncation at NUL Byte in dns.resolve |
Affected third-party component | Node.js |
Severity | High |
CVSS | Not published by the Node.js project as a numeric score; the Node.js security release and downstream advisories rate it High severity. |
Affected versions (upstream) | Node.js 26.x, 24.x, and 22.x lines prior to the October 2026 security release. |
What the vulnerability is
Node.js's dns.resolve function silently truncates a hostname at an embedded NUL byte. A hostname an application believes it is resolving, and a hostname containing a NUL byte followed by different text, can resolve to the same result, because everything after the NUL byte is discarded without warning.
Why you should pay attention
Applications that validate a hostname against an allowlist or block-list before resolving it can be deceived into resolving a different, unintended name, defeating SSRF (server-side request forgery) protections and domain allowlists built on string matching. This is the kind of flaw that an automated scanner looking only at the application's own validation logic will not catch, since the bypass happens inside the DNS resolution step itself.
WinMagic product assessment
SecureDoc Client, SES Console, and SESWeb
SecureDoc does not include, install or depend on a Node.js runtime.
Conclusion: SecureDoc Client, the SES Console and SESWeb are not affected by CVE-2026-105482.
Remediation
No WinMagic product-specific remediation, software update, patch, or configuration change is required in response to CVE-2026-105482. Organizations that run Node.js elsewhere in their own environment, outside of WinMagic products, should apply that vendor's own patch according to their standard process.
Ongoing monitoring
WinMagic continues to monitor relevant security advisories and available information concerning CVE-2026-105482. Should new information materially change this assessment, WinMagic will review its potential impact on SecureDoc Client, the SES Console or SESWeb and update this article accordingly.
Questions about this advisory
Customers with questions about this assessment can contact WinMagic Support through the usual support channel referencing KB-SEC-2026-1028-06.
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