CVE-2026-32661 - Vulnerability Analysis

Overview

GUARDIANWALL MailSuite and Mail Security Cloud contain a stack-based buffer overflow caused by improper handling of specially crafted requests in the web service, letting remote attackers execute arbitrary code, exploit requires product configured to run pop3wallpasswd with grdnwww user privilege.

Severity & Score

Impact

Remote attackers can execute arbitrary code, potentially leading to full system compromise.

Mitigation

Update to the latest version with the buffer overflow fix.

References

• https://jvn.jp/en/jp/JVN35567473/
• https://security-support.canon-its.jp/info_and_news/show/804?site_domain=GUARDIANWALL

Social Media Activity(1 post)

OffSequence

@offseq

May 13, 2026

🚨 CRITICAL: CVE-2026-32661 stack buffer overflow in Canon GUARDIANWALL MailSuite (v1.4.00 – 2.4.26). Remote code execution possible. Restrict network access & monitor pop3wallpasswd. Patch pending. https://radar.offseq.com/threat/cve-2026-32661-stack-based-buffer-overflow-in-cano-fe8551b1 #OffSeq #CVE202632661 #infosec #vuln

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Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner