CVE-2026-32661

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

May 13, 2026

Last Modified

May 13, 2026

Advisory Details (2)

Auto-updated Jul 26, 2026
No patch confirmed yet.
generic

【重要】GUARDIANWALL MailSuite スタックベースのバッファオーバーフロー脆弱性に | サポート情報｜GUARDIANWALLシリーズ｜キヤノンITソリューションズ

https://security-support.canon-its.jp/info_and_news/show/804?site_domain=GUARDIANWALL
generic

JVN#35567473: GUARDIANWALL MailSuite vulnerable to stack-based buffer overflow

https://jvn.jp/en/jp/JVN35567473/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 228 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-25 14:18 UTCEPSS rescore
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-24 14:17 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 03:09 UTCEG score recompute
  11. 2026-07-22 14:08 UTCEPSS rescore
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-21 15:24 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-20 17:08 UTCEPSS rescore
  17. 2026-07-19 14:31 UTCEPSS rescore
  18. 2026-07-19 14:31 UTCEPSS rescore
  19. 2026-07-19 02:29 UTCEPSS rescore
  20. 2026-07-18 10:04 UTCEPSS rescore
  21. 2026-07-18 10:04 UTCEPSS rescore
  22. 2026-07-16 17:03 UTCEPSS rescore
  23. 2026-07-16 17:03 UTCEPSS rescore
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 16:57 UTCEPSS rescore
Show 75 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 15:15 UTCEPSS rescore
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 02:23 UTCEPSS rescore
  14. 2026-07-06 02:23 UTCEPSS rescore
  15. 2026-07-05 02:30 UTCEPSS rescore
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-06-30 23:22 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 14:07 UTCEPSS rescore
  23. 2026-06-28 12:54 UTCGHSA enrichment
  24. 2026-06-28 08:21 UTCGHSA enrichment
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-28 04:56 UTCEPSS rescore
  27. 2026-06-28 03:42 UTCGHSA enrichment
  28. 2026-06-27 23:48 UTCGHSA enrichment
  29. 2026-06-27 13:13 UTCGHSA enrichment
  30. 2026-06-27 08:16 UTCGHSA enrichment
  31. 2026-06-27 03:08 UTCEPSS rescore
  32. 2026-06-26 20:35 UTCGHSA enrichment
  33. 2026-06-26 03:59 UTCGHSA enrichment
  34. 2026-06-25 20:10 UTCGHSA enrichment
  35. 2026-06-25 13:49 UTCEPSS rescore
  36. 2026-06-25 13:49 UTCEPSS rescore
  37. 2026-06-24 14:05 UTCEPSS rescore
  38. 2026-06-23 21:33 UTCEPSS rescore
  39. 2026-06-23 21:33 UTCEPSS rescore
  40. 2026-06-22 14:25 UTCEPSS rescore
  41. 2026-06-22 14:25 UTCEPSS rescore
  42. 2026-06-21 14:56 UTCEPSS rescore
  43. 2026-06-21 14:56 UTCEPSS rescore
  44. 2026-06-21 01:59 UTCEPSS rescore
  45. 2026-06-19 19:25 UTCEPSS rescore
  46. 2026-06-19 19:25 UTCEPSS rescore
  47. 2026-06-18 17:52 UTCEPSS rescore
  48. 2026-06-18 17:52 UTCEPSS rescore
  49. 2026-06-17 21:44 UTCGHSA enrichment
  50. 2026-06-17 17:53 UTCEPSS rescore
  51. 2026-06-17 14:49 UTCGHSA enrichment
  52. 2026-06-17 02:40 UTCGHSA enrichment
  53. 2026-06-16 22:46 UTCGHSA enrichment
  54. 2026-06-16 17:52 UTCEPSS rescore
  55. 2026-06-16 11:31 UTCGHSA enrichment
  56. 2026-06-16 07:28 UTCGHSA enrichment
  57. 2026-06-16 03:36 UTCGHSA enrichment
  58. 2026-06-15 17:49 UTCEPSS rescore
  59. 2026-06-15 06:06 UTCGHSA enrichment
  60. 2026-06-15 02:14 UTCGHSA enrichment
  61. 2026-06-14 23:18 UTCEPSS rescore
  62. 2026-06-14 22:21 UTCGHSA enrichment
  63. 2026-06-14 18:28 UTCGHSA enrichment
  64. 2026-06-14 14:22 UTCGHSA enrichment
  65. 2026-06-14 10:22 UTCGHSA enrichment
  66. 2026-06-14 06:23 UTCGHSA enrichment
  67. 2026-06-13 23:52 UTCGHSA enrichment
  68. 2026-06-13 23:00 UTCEPSS rescore
  69. 2026-06-13 09:21 UTCGHSA enrichment
  70. 2026-06-13 05:27 UTCGHSA enrichment
  71. 2026-06-13 01:30 UTCGHSA enrichment
  72. 2026-06-12 23:12 UTCEPSS rescore
  73. 2026-06-12 23:12 UTCEPSS rescore
  74. 2026-06-12 21:38 UTCGHSA enrichment
  75. 2026-06-12 17:44 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-32661?
CVE-2026-32661 is a critical vulnerability published on May 13, 2026. 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…
When was CVE-2026-32661 disclosed?
CVE-2026-32661 was first published in the National Vulnerability Database on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32661 actively exploited?
CVE-2026-32661 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.8% of all scored CVEs.
What is the CVSS score of CVE-2026-32661?
CVE-2026-32661 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-32661?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32661, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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