UBUNTU-CVE-2026-4371

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Source

https://ubuntu.com/security/CVE-2026-4371

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4371

Upstream

CVE-2026-4371

Published

2026-03-24T21:16:00Z

Modified

2026-06-30T18:18:11.452912468Z

Severity

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

Summary

[none]

Details

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

References

Affected packages

Ubuntu:18.04:LTS

mozjs52

Package

Name: mozjs52
Purl: pkg:deb/ubuntu/mozjs52?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

52.*

52.3.1-0ubuntu3

52.3.1-7fakesync1

52.8.1-0ubuntu0.18.04.1

52.9.1-0ubuntu0.18.04.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-0ubuntu0.18.04.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

mozjs38

Package

Name: mozjs38
Purl: pkg:deb/ubuntu/mozjs38?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

38.*

38.8.0~repack1-0ubuntu1

38.8.0~repack1-0ubuntu3

38.8.0~repack1-0ubuntu4

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-38-0",
            "binary_version": "38.8.0~repack1-0ubuntu4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

Ubuntu:20.04:LTS

mozjs68

Package

Name: mozjs68
Purl: pkg:deb/ubuntu/mozjs68?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

68.*

68.5.0-1~fakesync

68.5.0-2~fakesync

68.6.0-1

68.6.0-1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-68-0",
            "binary_version": "68.6.0-1ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

mozjs52

Package

Name: mozjs52
Purl: pkg:deb/ubuntu/mozjs52?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

52.*

52.9.1-1build1

52.9.1-1ubuntu3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-1ubuntu3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

Ubuntu:22.04:LTS

mozjs102

Package

Name: mozjs102
Purl: pkg:deb/ubuntu/mozjs102?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

102.*

102.11.0-0ubuntu0.22.04.1

102.12.0-0ubuntu0.22.04.1

102.13.0-0ubuntu0.22.04.1

102.15.1-0ubuntu0.22.04.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-102-0",
            "binary_version": "102.15.1-0ubuntu0.22.04.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

mozjs78

Package

Name: mozjs78
Purl: pkg:deb/ubuntu/mozjs78?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

78.*

78.13.0-1

78.15.0-2

78.15.0-4ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-78-0",
            "binary_version": "78.15.0-4ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

mozjs91

Package

Name: mozjs91
Purl: pkg:deb/ubuntu/mozjs91?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

91.*

91.5.1-0ubuntu1

91.6.0-1

91.6.0-2

91.7.0-2

91.10.0-0ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-91-0",
            "binary_version": "91.10.0-0ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

thunderbird

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown 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-2026-4371.json"

Ubuntu:24.04:LTS

mozjs102

Package

Name: mozjs102
Purl: pkg:deb/ubuntu/mozjs102?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

102.*

102.15.1-1

102.15.1-3ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-102-0t64",
            "binary_version": "102.15.1-3ubuntu2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"

mozjs115

Package

Name: mozjs115
Purl: pkg:deb/ubuntu/mozjs115?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

115.*

115.3.0-0ubuntu1

115.4.0-2

115.5.0-1

115.6.0-1

115.7.0-4

115.8.0-1

115.9.0-1

115.9.0-1build1

115.10.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libmozjs-115-0t64",
            "binary_version": "115.10.0-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4371.json"