UBUNTU-CVE-2026-34477

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Source
https://ubuntu.com/security/CVE-2026-34477
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-34477
Upstream
Published
2026-04-10T16:16:00Z
Modified
2026-05-20T16:12:55.032217366Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName attribute of the <Ssl> element. Although the verifyHostName configuration attribute was introduced in Log4j Core 2.12.0, it was silently ignored in all versions through 2.25.3, leaving TLS connections vulnerable to interception regardless of the configured value. A network-based attacker may be able to perform a man-in-the-middle attack when all of the following conditions are met: * An SMTP, Socket, or Syslog appender is in use. * TLS is configured via a nested <Ssl> element. * The attacker can present a certificate issued by a CA trusted by the appender's configured trust store, or by the default Java trust store if none is configured. This issue does not affect users of the HTTP appender, which uses a separate verifyHostname https://logging.apache.org/log4j/2.x/manual/appenders/network.html#HttpAppender-attr-verifyHostName attribute that was not subject to this bug and verifies host names by default. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.

References

Affected packages

Ubuntu:18.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.8.2-1
2.8.2-2
2.10.0-1
2.10.0-2
2.10.0-2ubuntu0.1
2.12.4-0ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.12.4-0ubuntu0.1",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:20.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.11.1-2
2.11.2-1
2.15.0-0.20.04.1
2.16.0-0.20.04.1
2.17.0-0.20.04.1
2.17.1-0.20.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.17.1-0.20.04.1",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:22.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.13.3-1
2.15.0-1
2.16.0-1
2.17.0-1
2.17.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.17.1-1",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:24.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.19.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.19.0-2",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:25.10
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.19.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.19.0-2",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:26.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.19.0-2
2.19.0-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.19.0-2build1",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"
Ubuntu:Pro:16.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2-1
2.4-1
2.4-2
2.4-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.4-2ubuntu0.1~esm1",
            "binary_name": "liblog4j2-java"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34477.json"