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CVE-2026-84640

🗓️ 01 Sep 2026 21:33:06Reported by mozillaType 
cve
 cve
🔗 web.nvd.nist.gov📰️ 1 Media mentions👁 34 Views

Thunderbird 155 one-byte buffer over-read in mail parser via crafted mail header.

Related
Detection
Affected
Refs
Social
ReporterTitlePublishedViews
Family
alpinelinux
AlpineLinux
CVE-2026-84640
1 Sep 202621:33
alpinelinux
circl
Circl
CVE-2026-84640
2 Sep 202604:48
circl
cvelist
Cvelist
CVE-2026-84640 One byte overflow read in mail parser
1 Sep 202621:33
cvelist
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
NVD
Node
OR
mozillathunderbirdRange<140.15.0
mozillathunderbirdRange141.0153.2.0
mozillathunderbirdRange154.0155.0
[
  {
    "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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03 Sep 2026 19:01Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.5
EPSS0.00263
SSVC
34