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CVE-2026-34478: Restore support for documented Rfc5424Layout attributes - #4074
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In `2.21.0`, `Rfc5424Layout` was migrated from a factory method to the builder pattern. During this change, the recognized names of several configuration attributes unintentionally diverged from the documented ones. As a result, some documented attributes were no longer recognized, while new, undocumented names were introduced. This change restores support for the documented attribute names while continuing to accept the names introduced in `2.21.0` for backward compatibility. Fixes #4022 Co-authored-by: Volkan Yazıcı <volkan@yazi.ci>
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Pull request overview
Restores Rfc5424Layout XML/config attribute name compatibility after the 2.21.0 builder migration, re-accepting documented attribute names while keeping 2.21.0-introduced aliases for backward compatibility.
Changes:
- Add documented
Rfc5424Layoutattribute names (newLine,newLineEscape,mdcIncludes/mdcExcludes/mdcRequired,useTlsMessageFormat) alongside existing compatibility aliases. - Add tests that build
Rfc5424Layoutvia the plugin system to verify both documented names and aliases are accepted. - Add a changelog entry for issue #4022.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| src/changelog/.2.x.x/4022_rfc5424-param-names.xml | Adds changelog entry documenting the fix. |
| log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java | Restores documented attribute names in the builder and maps aliases for compatibility. |
| log4j-core-test/src/test/java/org/apache/logging/log4j/core/layout/Rfc5424LayoutTest.java | Adds plugin-builder-based tests to ensure both documented attributes and compatibility aliases work. |
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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…n for Logs Upgrade Apache Log4j from 2.25.3 to 2.25.4 to remediate CVE-2026-34478 (CVSS 6.9 MEDIUM). VULNERABILITY: Log4j Core's Rfc5424Layout (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 (CWE-117, CWE-684). Two issues affect users of stream-based syslog services: - The newLineEscape attribute was silently renamed, disabling newline escaping for TCP framing (RFC 6587) and exposing CRLF injection. - The useTlsMessageFormat attribute was silently renamed, silently downgrading TLS framing (RFC 5425) to unframed TCP without newline escaping. REMEDIATION: Updated all Log4j dependency references from 2.25.3 to 2.25.4 across dependency constraints, build files, documentation, and test resources. References: https://nvd.nist.gov/vuln/detail/CVE-2026-34478 apache/logging-log4j2#4074 https://logging.apache.org/security.html#CVE-2026-34478
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…n for Logs Upgrade Apache Log4j from 2.25.3 to 2.25.4 on support/1.15 to remediate CVE-2026-34478 (CVSS 6.9 MEDIUM). Also corrects stale Log4j version references (2.17.2, 2.12.0, 2.5) missed during the prior GEODE-10544 upgrade. VULNERABILITY: Log4j Core's Rfc5424Layout (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 (CWE-117, CWE-684). Two issues affect users of stream-based syslog services: - The newLineEscape attribute was silently renamed, disabling newline escaping for TCP framing (RFC 6587) and exposing CRLF injection. - The useTlsMessageFormat attribute was silently renamed, silently downgrading TLS framing (RFC 5425) to unframed TCP without newline escaping. REMEDIATION: Updated all Log4j dependency references to 2.25.4 across dependency constraints, build files, expected POM, resource files, and documentation. Corrected stale 2.17.2/2.12.0/2.5 references that were missed by the prior GEODE-10544 upgrade. References: https://nvd.nist.gov/vuln/detail/CVE-2026-34478 apache/logging-log4j2#4074 https://logging.apache.org/security.html#CVE-2026-34478
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…n for Logs (#8006) Upgrade Apache Log4j from 2.25.3 to 2.25.4 on support/1.15 to remediate CVE-2026-34478 (CVSS 6.9 MEDIUM). Also corrects stale Log4j version references (2.17.2, 2.12.0, 2.5) missed during the prior GEODE-10544 upgrade. VULNERABILITY: Log4j Core's Rfc5424Layout (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 (CWE-117, CWE-684). Two issues affect users of stream-based syslog services: - The newLineEscape attribute was silently renamed, disabling newline escaping for TCP framing (RFC 6587) and exposing CRLF injection. - The useTlsMessageFormat attribute was silently renamed, silently downgrading TLS framing (RFC 5425) to unframed TCP without newline escaping. REMEDIATION: Updated all Log4j dependency references to 2.25.4 across dependency constraints, build files, expected POM, resource files, and documentation. Corrected stale 2.17.2/2.12.0/2.5 references that were missed by the prior GEODE-10544 upgrade. References: https://nvd.nist.gov/vuln/detail/CVE-2026-34478 apache/logging-log4j2#4074 https://logging.apache.org/security.html#CVE-2026-34478
JinwooHwang
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Apr 27, 2026
…n for Logs (#8005) Upgrade Apache Log4j from 2.25.3 to 2.25.4 to remediate CVE-2026-34478 (CVSS 6.9 MEDIUM). VULNERABILITY: Log4j Core's Rfc5424Layout (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 (CWE-117, CWE-684). Two issues affect users of stream-based syslog services: - The newLineEscape attribute was silently renamed, disabling newline escaping for TCP framing (RFC 6587) and exposing CRLF injection. - The useTlsMessageFormat attribute was silently renamed, silently downgrading TLS framing (RFC 5425) to unframed TCP without newline escaping. REMEDIATION: Updated all Log4j dependency references from 2.25.3 to 2.25.4 across dependency constraints, build files, documentation, and test resources. References: https://nvd.nist.gov/vuln/detail/CVE-2026-34478 apache/logging-log4j2#4074 https://logging.apache.org/security.html#CVE-2026-34478
JinwooHwang
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May 13, 2026
…n for Logs (#8005) Upgrade Apache Log4j from 2.25.3 to 2.25.4 to remediate CVE-2026-34478 (CVSS 6.9 MEDIUM). VULNERABILITY: Log4j Core's Rfc5424Layout (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 (CWE-117, CWE-684). Two issues affect users of stream-based syslog services: - The newLineEscape attribute was silently renamed, disabling newline escaping for TCP framing (RFC 6587) and exposing CRLF injection. - The useTlsMessageFormat attribute was silently renamed, silently downgrading TLS framing (RFC 5425) to unframed TCP without newline escaping. REMEDIATION: Updated all Log4j dependency references from 2.25.3 to 2.25.4 across dependency constraints, build files, documentation, and test resources. References: https://nvd.nist.gov/vuln/detail/CVE-2026-34478 apache/logging-log4j2#4074 https://logging.apache.org/security.html#CVE-2026-34478 (cherry picked from commit a4ec1d2)
ppkarwasz
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Rfc5424Layout attributesRfc5424Layout attributes
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In
2.21.0,Rfc5424Layoutwas migrated from a factory method to the builder pattern. During this change, the recognized names of several configuration attributes unintentionally diverged from the documented ones.As a result, some documented attributes were no longer recognized, while new, undocumented names were introduced.
This change restores support for the documented attribute names while continuing to accept the names introduced in
2.21.0for backward compatibility.Fixes #4022