Vulnerability-Lookup

CVE-2026-32661 (GCVE-0-2026-32661)

Vulnerability from cvelistv5 – Published: 2026-05-13 05:15 – Updated: 2026-05-13 10:49

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 10:44 UTC

CWE

CWE-121 - Stack-based buffer overflow

Assigner

jpcert jpcert root

References

2 references

URL	Tags
https://security-support.canon-its.jp/info_and_ne…
https://jvn.jp/en/jp/JVN35567473/

Impacted products

2 products

Vendor	Product	Version	CPE status
Canon Marketing Japan Inc.	GUARDIANWALL MailSuite (On-premises version)	Affected: Ver 1.4.00 to Ver 2.4.26	guessed
Canon Marketing Japan Inc.	GUARDIANWALL Mail Security Cloud (SaaS version)	Affected: versions before the maintenance on April 30 Affected: 2026	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-32661

Vulnerability from fkie_nvd - Published: 2026-05-13 06:16 - Updated: 2026-06-17 10:36

Severity

9.8 (Critical) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	vultures@jpcert.or.jp	https://jvn.jp/en/jp/JVN35567473/
	vultures@jpcert.or.jp	https://security-support.canon-its.jp/info_and_news/show/804?site_domain=GUARDIANWALL

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "GUARDIANWALL MailSuite (On-premises version)",
          "vendor": "Canon Marketing Japan Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "Ver 1.4.00 to Ver 2.4.26"
            }
          ]
        },
        {
          "product": "GUARDIANWALL Mail Security Cloud (SaaS version)",
          "vendor": "Canon Marketing Japan Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "versions before the maintenance on April 30"
            },
            {
              "status": "affected",
              "version": "2026"
            }
          ]
        }
      ],
      "source": "vultures@jpcert.or.jp"
    }
  ],
  "cveTags": [],
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    {
      "lang": "en",
      "value": "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\u0027s web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd with grdnwww user privilege."
    }
  ],
  "id": "CVE-2026-32661",
  "lastModified": "2026-06-17T10:36:10.603",
  "metrics": {
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "vultures@jpcert.or.jp",
        "type": "Secondary"
      }
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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GHSA-HRHG-9HFH-HWHJ

Vulnerability from github – Published: 2026-05-13 18:30 – Updated: 2026-05-13 18:30

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-32661"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-13T06:16:14Z",
    "severity": "CRITICAL"
  },
  "details": "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\u0027s web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd with grdnwww user privilege.",
  "id": "GHSA-hrhg-9hfh-hwhj",
  "modified": "2026-05-13T18:30:52Z",
  "published": "2026-05-13T18:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32661"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN35567473"
    },
    {
      "type": "WEB",
      "url": "https://security-support.canon-its.jp/info_and_news/show/804?site_domain=GUARDIANWALL"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

JVNDB-2026-000072

Vulnerability from jvndb - Published: 2026-05-13 06:41 - Updated:2026-05-15 06:37

Severity

9.8 (Critical) - cvssV3_0 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

GUARDIANWALL MailSuite vulnerable to stack-based buffer overflow

Details

GUARDIANWALL MailSuite provided by Canon Marketing Japan Inc. contains the following vulnerability.

Stack-based buffer overflow in pop3wallpasswd command (CWE-121) - CVE-2026-32661
This can be exploited only when the product is configured to run pop3wallpasswd with grdnwww user privilege

The developer states that attacks exploiting the vulnerability has been observed in GUARDIANWALL MailSuite (On-premises version). Canon Marketing Japan Inc. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN. JPCERT/CC and Canon Marketing Japan Inc. coordinated under the Information Security Early Warning Partnership.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN35567473/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-32661
	JPCERT AT	https://www.jpcert.or.jp/at/2026/at260013.html
	Buffer Errors(CWE-119)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

	Canon Marketing Japan Inc.	GUARDIANWALL MailSuite
	Canon Marketing Japan Inc.	GUARDIANWALL Mail Security Cloud

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{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000072.html",
  "dc:date": "2026-05-15T15:37+09:00",
  "dcterms:issued": "2026-05-13T15:41+09:00",
  "dcterms:modified": "2026-05-15T15:37+09:00",
  "description": "GUARDIANWALL MailSuite provided by Canon Marketing Japan Inc. contains the following vulnerability.\u003cul\u003e\u003cli\u003eStack-based buffer overflow in pop3wallpasswd command (CWE-121) - CVE-2026-32661\u003c/li\u003e\u003cli\u003eThis can be exploited only when the product is configured to run pop3wallpasswd with grdnwww user privilege\u003c/li\u003e\u003c/ul\u003eThe developer states that attacks exploiting the vulnerability has been observed in GUARDIANWALL MailSuite (On-premises version).\r\n\r\nCanon Marketing Japan Inc. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN.\r\nJPCERT/CC and Canon Marketing Japan Inc. coordinated under the Information Security Early Warning Partnership.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000072.html",
  "sec:cpe": [
    {
      "#text": "cpe:/a:misc:canon_marketing_japan_guardianwall_mailsuite",
      "@product": "GUARDIANWALL MailSuite",
      "@vendor": "Canon Marketing Japan Inc.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/a:misc:canon_marketing_japan_guardianwall_mail_security_cloud",
      "@product": "GUARDIANWALL Mail Security Cloud",
      "@vendor": "Canon Marketing Japan Inc.",
      "@version": "2.2"
    }
  ],
  "sec:cvss": {
    "@score": "9.8",
    "@severity": "Critical",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000072",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN35567473/index.html",
      "@id": "JVN#35567473",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-32661",
      "@id": "CVE-2026-32661",
      "@source": "CVE"
    },
    {
      "#text": "https://www.jpcert.or.jp/at/2026/at260013.html",
      "@id": "JPCERT-AT-2026-0013",
      "@source": "JPCERT AT"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-119",
      "@title": "Buffer Errors(CWE-119)"
    }
  ],
  "title": "GUARDIANWALL MailSuite vulnerable to stack-based buffer overflow"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-32661 (GCVE-0-2026-32661)

FKIE_CVE-2026-32661

GHSA-HRHG-9HFH-HWHJ

JVNDB-2026-000072

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