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CVE-2026-84640 One byte overflow read in mail parser

🗓️ 01 Sep 2026 21:33:06Reported by mozillaType 
cvelist
 cvelist
🔗 www.cve.org👁 40 Views

One byte out-of-bounds read in Thunderbird 155 mail parser via crafted mail header.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
alpinelinux
AlpineLinux
CVE-2026-84640
1 Sep 202621:33
alpinelinux
circl
Circl
CVE-2026-84640
2 Sep 202604:48
circl
cve
CVE
CVE-2026-84640
1 Sep 202621:33
cve
debian
Debian
[SECURITY] [DLA 4775-1] thunderbird security update
7 Sep 202610:00
debian
debian
Debian
[SECURITY] [DSA 6483-1] thunderbird security update
4 Sep 202618:04
debian
debiancve
Debian CVE
CVE-2026-84640
1 Sep 202621:33
debiancve
nessus
Tenable Nessus
Debian dla-4775 : thunderbird - security update
7 Sep 202600:00
nessus
nessus
Tenable Nessus
Debian dsa-6483 : thunderbird - security update
4 Sep 202600:00
nessus
nessus
Tenable Nessus
Fedora 44 : thunderbird (2026-379e77483b)
20 Sep 202600:00
nessus
nessus
Tenable Nessus
Fedora 45 : thunderbird (2026-aa0e0deed1)
19 Sep 202600:00
nessus
Rows per page
[
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.15",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "153.2",
        "lessThanOrEqual": "153.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "155",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

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