WinMagic
Security Advisory
CVE-2026-106070 — ZipFile Returns Prefix Bytes After Failed Header Validation
Reference: KB-SEC-2026-1028-10 | Published: October 28, 2026 | Status: Not Affected
Applies to: SecureDoc Client, SES Console, SESWeb (all versions)
Third-party component affected: Node.js | Severity: Low
Executive summary
WinMagic is aware of CVE-2026-106070 (ZipFile Returns Prefix Bytes After Failed Header Validation), 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-2026-106070 |
Title | ZipFile Returns Prefix Bytes After Failed Header Validation |
Affected third-party component | Node.js |
Severity | Low |
CVSS | Not published by the Node.js project as a numeric score; the Node.js security release and downstream advisories rate it Low severity. |
Affected versions (upstream) | Node.js 26.x line prior to the October 2026 security release. |
What the vulnerability is
Node.js's internal ZipFile handling returns a portion of the file's leading bytes even when the archive's header validation has already failed, instead of discarding the data outright.
Why you should pay attention
This is a limited information disclosure issue: a small amount of data from a file that should have been rejected can leak back to code or a caller that processes zip archives in Node.js, which matters for applications that treat failed validation as an assurance that no content from a bad archive is ever exposed.
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-2026-106070.
Remediation
No WinMagic product-specific remediation, software update, patch, or configuration change is required in response to CVE-2026-106070. 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-2026-106070. 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-2026-1028-10.
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