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Critical · 9.8 CVE-2026-32661 EUVD-2026-29911GHSA-hrhg-9hfh-hwhj

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version). If a remote…

Published May 13, 2026 · Updated May 13, 2026 · Assigned by jpcert

Vendor: Canon Marketing Japan Product: GUARDIANWALL Mail Security Cloud (SaaS version) Product: GUARDIANWALL MailSuite (On-premises version)

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.

Affected products

VendorProductAffectedFixed
Canon Marketing Japan GUARDIANWALL MailSuite (On-premises version) Ver 1.4.00 to Ver 2.4.26 —
Canon Marketing Japan GUARDIANWALL Mail Security Cloud (SaaS version) versions before the maintenance on April 30, 2026 —

References