CVE-2026-32661
Critical
Description
Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version). If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd with grdnwww user privilege.
SeverityCritical
CVSS9.3
Exploit probability—
ProductGUARDIANWALL MailSuite (On-premises version)
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-121CWE-121
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Canon Marketing Japan Inc. GUARDIANWALL MailSuite (On-premises version) | Ver 1.4.00 to Ver 2.4.26 | — |
| Canon Marketing Japan Inc. GUARDIANWALL Mail Security Cloud (SaaS version) | versions before the maintenance on April 30, 2026 | — |
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