# 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.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 May 2026
- **Updated:** 13 May 2026
- **Also known as:** GHSA-hrhg-9hfh-hwhj

## 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 (Stack-based Buffer Overflow)

## 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.

## Is CVE-2026-32661 being exploited?

There is no known exploitation of CVE-2026-32661 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-32661 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-32661 in the wild and no public exploit code.

Affected product: Canon Marketing Japan Inc. GUARDIANWALL Mail Security Cloud (SaaS version). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-32661/ (Markdown: https://insights.sbomify.com/CVE-2026-32661/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-32661
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-32661
- OSV: https://osv.dev/vulnerability/CVE-2026-32661

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-32661/
Summaries are generated and may contain mistakes; the official description above is the record.