UBUNTU-CVE-2026-84639

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Source

https://ubuntu.com/security/CVE-2026-84639

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84639.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-84639

Upstream

CVE-2026-84639

Published

2026-09-01T22:17:00Z

Modified

2026-09-16T14:03:21Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

References

Affected packages

Ubuntu:22.04:LTS / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/ubuntu/thunderbird?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1:91.*

1:91.1.2+build1-0ubuntu1

1:91.3.0+build2-0ubuntu1

1:91.3.1+build1-0ubuntu1

1:91.3.2+build1-0ubuntu1

1:91.4.0+build1.1-0ubuntu1

1:91.4.0+build2-0ubuntu1

1:91.5.0+build1-0ubuntu1

1:91.5.1+build1-0ubuntu1

1:91.6.1+build1-0ubuntu1

1:91.7.0+build1-0ubuntu1

1:91.7.0+build2-0ubuntu1

1:91.8.0+build2-0ubuntu1

1:91.9.1+build1-0ubuntu0.22.04.1

1:91.11.0+build2-0ubuntu0.22.04.1

1:102.*

1:102.2.2+build1-0ubuntu0.22.04.1

1:102.4.2+build2-0ubuntu0.22.04.1

1:102.7.1+build2-0ubuntu0.22.04.1

1:102.8.0+build2-0ubuntu0.22.04.1

1:102.9.0+build1-0ubuntu0.22.04.1

1:102.10.0+build2-0ubuntu0.22.04.1

1:102.11.0+build1-0ubuntu0.22.04.1

1:102.13.0+build1-0ubuntu0.22.04.1

1:102.15.0+build1-0ubuntu0.22.04.1

1:102.15.1+build1-0ubuntu0.22.04.1

1:115.*

1:115.3.1+build1-0ubuntu0.22.04.2

1:115.4.1+build1-0ubuntu0.22.04.1

1:115.5.0+build1-0ubuntu0.22.04.1

1:115.6.0+build2-0ubuntu0.22.04.1

1:115.8.1+build1-0ubuntu0.22.04.1

1:115.9.0+build1-0ubuntu0.22.04.1

1:115.10.1+build1-0ubuntu0.22.04.1

1:115.11.0+build2-0ubuntu0.22.04.1

1:115.12.0+build3-0ubuntu0.22.04.1

1:115.13.0+build5-0ubuntu0.22.04.1

1:115.15.0+build1-0ubuntu0.22.04.1

1:115.16.0+build2-0ubuntu0.22.04.1

1:115.18.0+build1-0ubuntu0.22.04.1

1:128.*

1:128.12.0+build1-0ubuntu0.22.04.1

1:140.*

1:140.7.1+build1-0ubuntu0.22.04.1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "thunderbird",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        },
        {
            "binary_name":  "thunderbird-gnome-support",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        },
        {
            "binary_name":  "thunderbird-mozsymbols",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        },
        {
            "binary_name":  "xul-ext-calendar-timezones",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        },
        {
            "binary_name":  "xul-ext-gdata-provider",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        },
        {
            "binary_name":  "xul-ext-lightning",
            "binary_version":  "1:140.7.1+build1-0ubuntu0.22.04.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84639.json"

Ubuntu:24.04:LTS / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/ubuntu/thunderbird?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1:115.*

1:115.3.1+build1-0ubuntu1

1:115.4.1+build1-0ubuntu1

1:115.4.3+build1-0ubuntu1

1:115.5.0+build1-0ubuntu1

1:115.5.1+build1-0ubuntu1

1:115.5.2+build2-0ubuntu1

1:115.6.0+build1-0ubuntu1

1:115.6.0+build2-0ubuntu1

1:115.6.1+build1-0ubuntu1

1:115.8.0+build1-0ubuntu1

1:115.8.1+build1+snap2

1:115.8.1+build1+snap3

Other

2:1snap1-0ubuntu1

2:1snap1-0ubuntu3

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "thunderbird",
            "binary_version":  "2:1snap1-0ubuntu3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84639.json"

Ubuntu:26.04:LTS / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/ubuntu/thunderbird?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

Other

2:1snap1-0ubuntu3

2:1snap1-0ubuntu4

2:1snap1-0ubuntu5

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "thunderbird",
            "binary_version":  "2:1snap1-0ubuntu5"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84639.json"