High
apache-log4j1.2, apache-log4j2 — security advisory
Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes. Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly: * The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output. * The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping. Users of the SyslogAppender are not affected, as its configuration attributes were not modified. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.
- 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-2026-34478
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:00 UTC · Revision 1
Source evidence
Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes. Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly: * The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output. * The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping. Users of the SyslogAppender are not affected, as its configuration attributes were not modified. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.
osv:UBUNTU-CVE-2026-34478
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
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-34478",
"method": "structured",
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"summary": "Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes. Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly: * The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output. * The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping. Users of the SyslogAppender are not affected, as its configuration attributes were not modified. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.",
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],
"modified": "2026-10-17T13:00:01.431161025Z",
"provider": "osv",
"upstream": [
"CVE-2026-34478"
],
"references": [
"https://ubuntu.com/security/CVE-2026-34478",
"https://www.cve.org/CVERecord?id=CVE-2026-34478",
"https://lists.apache.org/thread/3k1clr2l6vkdnl4cbhjrnt1nyjvb5gwt",
"https://logging.apache.org/security.html#CVE-2026-34478",
"https://github.com/apache/logging-log4j2/pull/4074",
"https://logging.apache.org/cyclonedx/vdr.xml",
"https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout"
]
},
"related_cves": [
{
"value": "CVE-2026-34478",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360140,
"published_at": "2026-04-10T16:16:00+00:00"
}