CVE-2026-32661 Memory corruption in GUARDIANWALL Mail Security Cloud (SaaS version)
Remote attackers can execute arbitrary code via crafted requests if the mail security product is configured to run pop3wallpasswd with specific user privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-32661?
CVE-2026-32661 is a critical memory corruption vulnerability in Canon Marketing Japan Inc. GUARDIANWALL Mail Security Cloud (SaaS version), published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-32661?
How do I fix CVE-2026-32661?
No fix has been published for CVE-2026-32661 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-32661 being exploited?
There is no known exploitation of CVE-2026-32661 in the wild and no public exploit code.
Sources
Also known as GHSA-hrhg-9hfh-hwhj.