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CVE-2026-34478

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 6
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:dce269fbed4db2340c8fe4bdc7ada908b22b1f6d55e306393ce4a9339dbcb6ea
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-117","description":"CWE-117 Improper Output Neutralization for Logs","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-684","description":"CWE-684 Incorrect Provision of Specified Functionality","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://repo.maven.apache.org/maven2","cpes":["cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","packageName":"org.apache.logging.log4j:log4j-core","packageURL":"pkg:maven/org.apache.logging.log4j/log4j-core","product":"Apache Log4j Core","vendor":"Apache Software Foundation","versions":[{"lessThan":"2.25.4","status":"affected","version":"2.21.0","versionType":"maven"},{"lessThanOrEqual":"3.0.0-beta3","status":"affected","version":"3.0.0-beta1","versionType":"maven"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NO…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-117","description":"CWE-117 Improper Output Neutralization for Logs","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-684","description":"CWE-684 Incorrect Provision of Specified Functionality","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/04/10/7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/adp/0/references/0
{"tags":["patch"],"url":"https://github.com/apache/logging-log4j2/pull/4074"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/references/0
{"tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/3k1clr2l6vkdnl4cbhjrnt1nyjvb5gwt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/references/4
{"tags":["vendor-advisory"],"url":"https://logging.apache.org/cyclonedx/vdr.xml"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/references/2
{"tags":["related"],"url":"https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/references/3
{"tags":["vendor-advisory"],"url":"https://logging.apache.org/security.html#CVE-2026-34478"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bdfedc170b3aa7df22e04c12051879504ae208c68297619a3681f772c51e1876 · sha256:1e69da28af361a88… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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