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CVE-2026-103500 Heap buffer overflow opening large email

🗓️ 30 Sep 2026 17:15:06Reported by mozillaType 
cvelist
 cvelist
🔗 www.cve.org👁 51 Views

Heap buffer overflow in Thunderbird when opening emails 2GB or larger.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-103500
1 Oct 202620:00
–circl
cve
CVE
CVE-2026-103500
30 Sep 202617:15
–cve
debian
Debian
[SECURITY] [DLA 4810-1] thunderbird security update
1 Oct 202622:45
–debian
debian
Debian
[SECURITY] [DSA 6536-1] thunderbird security update
1 Oct 202618:35
–debian
debiancve
Debian CVE
CVE-2026-103500
30 Sep 202617:15
–debiancve
nessus
Tenable Nessus
Debian dla-4810 : thunderbird - security update
1 Oct 202600:00
–nessus
nessus
Tenable Nessus
Debian dsa-6536 : thunderbird - security update
1 Oct 202600:00
–nessus
nessus
Tenable Nessus
Mozilla Thunderbird < 140.17
30 Sep 202600:00
–nessus
nessus
Tenable Nessus
Mozilla Thunderbird < 153.4
30 Sep 202600:00
–nessus
nessus
Tenable Nessus
Mozilla Thunderbird < 157.0
30 Sep 202600:00
–nessus
Rows per page
[
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.17",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "153.4",
        "lessThanOrEqual": "153.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "157",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

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21 Oct 2026 17:24Current
CVSS 3.16.3
EPSS0.00214
SSVC
51