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CVE-2026-32661 is a stack-based buffer overflow vulnerability in Canon Marketing Japan's GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS version). The flaw is reachable via the product's web service: a remote attacker can send a specially crafted request that triggers the overflow. When the product is configured to run pop3wallpasswd with grdnwww user privilege, successful exploitation can result in arbitrary code execution. Public reporting indicates the issue is exploitable without authentication. Confirmed affected on-premises versions are GUARDIANWALL MailSuite 1.4.00 through 2.4.26. The vendor also indicated the SaaS offering was affected but remediated during maintenance on 2026-04-30. The developer further stated that exploitation in the wild has already been confirmed against the on-premises product.
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Cross-references every affected SKU, including bundled OEM variants.
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