High
apache-log4j1.2, apache-log4j2 — security advisory
The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. Two groups of users are affected: * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file. * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class. Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue. Note: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.
- Products
- apache-log4j1.2, apache-log4j2
- Affected versions
- 1.2.17-10, 1.2.17-11, 1.2.17-11build1, 1.2.17-3ubuntu1, 1.2.17-4ubuntu1, 1.2.17-4ubuntu2, 1.2.17-4ubuntu3, 1.2.17-4ubuntu3+esm1, 1.2.17-4ubuntu3+esm2, 1.2.17-6ubuntu1, 1.2.17-7ubuntu1, 1.2.17-7ubuntu1+esm1, 1.2.17-7ubuntu1+esm2, 1.2.17-7ubuntu2, 1.2.17-8, 1.2.17-8+deb10u1build0.18.04.1, 1.2.17-8+deb10u1ubuntu0.1, 1.2.17-8+deb10u1ubuntu0.2, 1.2.17-9, 1.2.17-9ubuntu0.1, 1.2.17-9ubuntu0.2, 2.10.0-1, 2.10.0-2, 2.10.0-2ubuntu0.1, 2.11.1-2, 2.11.2-1, 2.12.4-0ubuntu0.1, 2.13.3-1, 2.15.0-0.20.04.1, 2.15.0-1, 2.16.0-0.20.04.1, 2.16.0-1, 2.17.0-0.20.04.1, 2.17.0-1, 2.17.1-0.20.04.1, 2.17.1-1, 2.19.0-2, 2.19.0-2build1, 2.2-1, 2.4-1, 2.4-2, 2.4-2ubuntu0.1~esm1, 2.8.2-1, 2.8.2-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-34479
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:00 UTC · Revision 1
Source evidence
The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. Two groups of users are affected: * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file. * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class. Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue. Note: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.
osv:UBUNTU-CVE-2026-34479
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
apache-log4j1.2
Fixed versions: Not specified
apache-log4j2
Fixed versions: Not specified
Complete source record
{
"id": "41b40b75a1ce3dc2bd41b4a40519b8eed63e093730c3829d55a11c207d339d8c",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-34479",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-34479",
"summary": "The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. Two groups of users are affected: * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file. * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class. Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue. Note: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.",
"evidence": "osv:UBUNTU-CVE-2026-34479",
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"aliases": [
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},
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],
"modified": "2026-10-17T13:00:01.720215466Z",
"provider": "osv",
"upstream": [
"CVE-2026-34479"
],
"references": [
"https://ubuntu.com/security/CVE-2026-34479",
"https://www.cve.org/CVERecord?id=CVE-2026-34479",
"https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on",
"https://logging.apache.org/security.html#CVE-2026-34479",
"https://github.com/apache/logging-log4j2/pull/4078",
"https://logging.apache.org/cyclonedx/vdr.xml",
"https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html"
]
},
"related_cves": [
{
"value": "CVE-2026-34479",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360150,
"published_at": "2026-04-10T16:16:00+00:00"
}