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CVE-2026-34479 Apache Log4j

Affected softwareApache Log4j
Severity6.9 Medium CVSS 4.0 2 scores
Fixed in2.25.4
WeaknessCWE-116
Published10 Apr 2026
Updated26 Oct 2026

Description

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.54% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/logging-log4j2 #4078.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/apache/logging-log4j2/pull/4078 : a pull request: the change under review

CVSS

6.9 MEDIUM v4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 4.0 6.9 MEDIUM 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X security@apache.org Secondary published
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Security (Apache Log4j) (47.0.0.2.0)
Oracle Hospitality Applications / OPERA Login (Apache Log4j) (5.6.28.2)
Oracle Retail Applications / Application Core (Apache Log4j) (15.0, 16.0)
Oracle Retail Applications / Security (Apache Log4j) (19.0.1.044)
Oracle Critical Patch Update July 2026 ↗ CPU 2026-Q3 Oracle Communications / Alarms, KPI, and Measurements (Apache Log4j) (25.2.200)
Oracle Communications / CMP (Apache Log4j) (15.0.0.0)
Oracle Communications / Configuration (Apache Log4j) (25.2.201)
Oracle Communications / Core (Apache Log4j) (6.1.1-7.0.0)
Oracle Communications / Install (Apache Log4j) (24.2.5)
Oracle Communications / Install (Apache Log4j) (25.2.200)
Oracle Communications / Management (Apache Log4j) (10.5.0.1.0, 10.5.0.2.0)
Oracle Communications / NM Core (Apache Log4j) (15.0.0.0.0-15.2.0.0.0)
Oracle Communications / Patch Request (Apache Log4j) (8.0.0.7.0-8.3.0.3.0)
Oracle Communications / Platform (Apache Log4j) (15.0.0.0.0, 15.0.1.0.0, 15.1.0.0.0, 15.2.0.0.0)
Oracle Communications / SEPP (Apache Log4j) (25.1.203, 25.2.200)
Oracle Communications / Security (Apache Log4j) (25.2.0.0.0)
Oracle Communications / Security (Apache Log4j) (8.0.0, 7.5.0, 7.4.1)
Oracle Communications / Security (Apache Log4j) (8.1.0.0)
Oracle Communications / Security Component (Apache Log4j) (7.5.0, 7.5.1, 7.6.0, 7.7.0, 7.8.0, 8.0.1)
Oracle Communications / Security issues (Apache Log4j) (15.0.0.0.0, 15.0.1.0.0, 15.1.0.0.0, 15.2.0.0.0)
Oracle Communications / Signaling (Apache Log4j) (25.1.200, 25.2.100, 25.2.200)
Oracle Communications / XMPP Server (Apache Log4j) (10.0.1.8.0)
Oracle Construction and Engineering / Admin (Apache Log4j) (21.12-21.12.17)
Oracle Construction and Engineering / Platform (Apache Log4j) (21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.14, 25.12.0-25.12.6)
Oracle Financial Services Applications / Installer (Apache Log4j) (8.1.2.7)
Oracle Financial Services Applications / Platform (Apache Log4j) (8.0.7.9.0, 8.0.8.7.0, 8.1.2.5.0)
Oracle Financial Services Applications / Reports (Apache Log4j) (8.1.2.9)
Oracle Fusion Middleware / Centralized Thirdparty Jars (Apache Log4j) (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0)
Oracle Fusion Middleware / Installer (Apache Log4j) (12.2.1.4.0, 14.1.2.1.0)
Oracle Fusion Middleware / MFT Runtime Server (Apache Log4j) (12.2.1.4.0, 14.1.2.0.0)
Oracle Fusion Middleware / Runtime Engine (Apache Log4j) (12.2.1.4.0, 14.1.2.0.0)
Oracle Fusion Middleware / Third Party (Apache Log4j) (14.1.2.0.0)
Oracle Fusion Middleware / Third Party Analysis Tool (Apache Log4j) (12.2.1.4.0)
Oracle GoldenGate / Security (Apache Log4j) (26.1.0.0.0)
Oracle HealthCare Applications / FHIR Server (Apache Log4j) (8.2.0.0-8.2.0.7)
Oracle HealthCare Applications / Health Policy Engine (Apache Log4j) (4.0.0-4.0.2)
Oracle HealthCare Applications / Master Index Data Manager (Apache Log4j) (5.0.0.0-5.0.9.6)
Oracle Retail Applications / BDI Job Scheduler (Apache Log4j) (16.0.3, 19.0.1)
Oracle Retail Applications / EBS Integration (Apache Log4j) (16.0.3, 19.0.1)
Oracle Retail Applications / Installation (Apache Log4j) (21.0.0-25.0.0)
Oracle Retail Applications / Mathematical Operators (Apache Log4j) (13.2.8)
Oracle Retail Applications / PeopleSoft Integration (Apache Log4j) (16.0.3, 19.0.1)
Oracle Retail Applications / Point of Sale (Apache Log4j) (21.0.5-25.0.1)
Oracle Retail Applications / RIB Kernal (Apache Log4j) (16.0.3, 19.0.1)
Oracle Retail Applications / RSB Installation (Apache Log4j) (16.0.3, 19.0.1)
Oracle Retail Applications / Security (Apache Log4j) (16.0.3)
Oracle Spatial Studio / Install issues (Apache Log4j) (23.2.1, 24.2)
Oracle Supply Chain / Installation Issues (Apache Log4j) (3.6.1)
Oracle Utilities Applications / Security (Apache Log4j) (4.3.0.6.0, 4.4.0.0.0, 4.4.0.2.0-4.4.0.4.0, 4.5.0.0.0, 4.5.0.1.1, 4.5.0.1.3, 4.5.0.2.0, 25.4, 25.10, 26.4)
Oracle Utilities Applications / Tools (Apache Log4j) (7.0.0.0.8, 7.0.0.1.7, 25.4.0.0.3)
Oracle Critical Security Patch Update August 2026 ↗ CSPU 2026-Q3 Oracle Enterprise Manager / EM Plugin: General (Apache Log4j) (13.5.1.0.0-13.5.6.0.0)
Oracle Financial Services Applications / ECM (Apache Log4j) (8.0.8.2, 8.1.2.11)
Oracle Financial Services Applications / Third Party (Apache Log4j) (8.0.8.1, 8.1.2.11)
Oracle Financial Services Applications / User Interface (Apache Log4j) (8.0.8.0)
Oracle Hyperion / Installation/Configuration (Apache Log4j) (11.2.25.0.000)
Oracle Retail Applications / Application Core (Apache Log4j) (15.0, 16.0)
Oracle Retail Applications / NF Issuing (Apache Log4j) (14.2)
Oracle Retail Applications / Operations & Maintenance (Apache Log4j) (15.0, 16.0)
Oracle Supply Chain / CAX Client (Apache Log4j) (3.6)
Oracle Critical Security Patch Update September 2026 ↗ CSPU 2026-Q3 Oracle Financial Services Applications / Infrastructure (Apache Log4j) (14.5.0.0.0-14.9.0.0.0)
Oracle Critical Security Patch Update June 2026 ↗ CSPU 2026-Q2 Oracle Communications / Other (Apache Log4j) (7.3.6, 7.4.0, 7.5.0, 8.0.0)
Oracle Enterprise Manager / Agent Next Gen (Apache Log4j) (13.5, 24.1)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Alarms, KPI, and Measurements (Apache Log4j) 25.2.200 25.2.200
Oracle Communications CMP (Apache Log4j) 15.0.0.0 15.0.0.0
Oracle Communications Configuration (Apache Log4j) 25.2.201 25.2.201
Oracle Communications Core (Apache Log4j) 6.1.1-7.0.0
Oracle Communications Install (Apache Log4j) 24.2.5 24.2.5 · 25.2.200
Oracle Communications Management (Apache Log4j) 10.5.0.1.0, 10.5.0.2.0 10.5.0.1.0 · 10.5.0.2.0
Oracle Communications NM Core (Apache Log4j) 15.0.0.0.0-15.2.0.0.0
Oracle Communications Other (Apache Log4j) 7.3.6, 7.4.0, 7.5.0, 8.0.0 7.3.6 · 7.4.0 · 7.5.0 · 8.0.0
Oracle Communications Patch Request (Apache Log4j) 8.0.0.7.0-8.3.0.3.0
Oracle Communications Platform (Apache Log4j) 15.0.0.0.0, 15.0.1.0.0, 15.1.0.0.0, 15.2.0.0.0 15.0.0.0.0 · 15.0.1.0.0 · 15.1.0.0.0 · 15.2.0.0.0
Oracle Communications SEPP (Apache Log4j) 25.1.203, 25.2.200 25.1.203 · 25.2.200
Oracle Communications Security (Apache Log4j) 8.0.0, 7.5.0, 7.4.1 7.4.1 · 7.5.0 · 8.0.0 · 8.1.0.0 · 25.2.0.0.0 · 47.0.0.2.0
Oracle Communications Security Component (Apache Log4j) 7.5.0, 7.5.1, 7.6.0, 7.7.0, 7.8.0, 8.0.1 7.5.0 · 7.5.1 · 7.6.0 · 7.7.0 · 7.8.0 · 8.0.1
Oracle Communications Security issues (Apache Log4j) 15.0.0.0.0, 15.0.1.0.0, 15.1.0.0.0, 15.2.0.0.0 15.0.0.0.0 · 15.0.1.0.0 · 15.1.0.0.0 · 15.2.0.0.0
Oracle Communications Signaling (Apache Log4j) 25.1.200, 25.2.100, 25.2.200 25.1.200 · 25.2.100 · 25.2.200
Oracle Communications XMPP Server (Apache Log4j) 10.0.1.8.0 10.0.1.8.0
Oracle Construction and Engineering Admin (Apache Log4j) 21.12-21.12.17
Oracle Construction and Engineering Platform (Apache Log4j) 21.12.0-21.12.17, 22.12.0-22.12.15, 23.12.0-23.12.16, 24.12.0-24.12.14, 25.12.0-25.12.6
Oracle Enterprise Manager Agent Next Gen (Apache Log4j) 13.5, 24.1 13.5 · 24.1
Oracle Enterprise Manager EM Plugin: General (Apache Log4j) 13.5.1.0.0-13.5.6.0.0
Oracle Financial Services Applications ECM (Apache Log4j) 8.0.8.2, 8.1.2.11 8.0.8.2 · 8.1.2.11
Oracle Financial Services Applications Infrastructure (Apache Log4j) 14.5.0.0.0-14.9.0.0.0
Oracle Financial Services Applications Installer (Apache Log4j) 8.1.2.7 8.1.2.7
Oracle Financial Services Applications Platform (Apache Log4j) 8.0.7.9.0, 8.0.8.7.0, 8.1.2.5.0 8.0.7.9.0 · 8.0.8.7.0 · 8.1.2.5.0
Oracle Financial Services Applications Reports (Apache Log4j) 8.1.2.9 8.1.2.9
Oracle Financial Services Applications Third Party (Apache Log4j) 8.0.8.1, 8.1.2.11 8.0.8.1 · 8.1.2.11
Oracle Financial Services Applications User Interface (Apache Log4j) 8.0.8.0 8.0.8.0
Oracle Fusion Middleware Centralized Thirdparty Jars (Apache Log4j) 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0 12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0 · 15.1.1.0.0
Oracle Fusion Middleware Installer (Apache Log4j) 12.2.1.4.0, 14.1.2.1.0 12.2.1.4.0 · 14.1.2.1.0
Oracle Fusion Middleware MFT Runtime Server (Apache Log4j) 12.2.1.4.0, 14.1.2.0.0 12.2.1.4.0 · 14.1.2.0.0
Oracle Fusion Middleware Runtime Engine (Apache Log4j) 12.2.1.4.0, 14.1.2.0.0 12.2.1.4.0 · 14.1.2.0.0
Oracle Fusion Middleware Third Party (Apache Log4j) 14.1.2.0.0 14.1.2.0.0
Oracle Fusion Middleware Third Party Analysis Tool (Apache Log4j) 12.2.1.4.0 12.2.1.4.0
Oracle GoldenGate Security (Apache Log4j) 26.1.0.0.0 26.1.0.0.0
Oracle HealthCare Applications FHIR Server (Apache Log4j) 8.2.0.0-8.2.0.7
Oracle HealthCare Applications Health Policy Engine (Apache Log4j) 4.0.0-4.0.2
Oracle HealthCare Applications Master Index Data Manager (Apache Log4j) 5.0.0.0-5.0.9.6
Oracle Hospitality Applications OPERA Login (Apache Log4j) 5.6.28.2 5.6.28.2
Oracle Hyperion Installation/Configuration (Apache Log4j) 11.2.25.0.000 11.2.25.0.0
Oracle Retail Applications Application Core (Apache Log4j) 15.0, 16.0 15.0 · 16.0
Oracle Retail Applications BDI Job Scheduler (Apache Log4j) 16.0.3, 19.0.1 16.0.3 · 19.0.1
Oracle Retail Applications EBS Integration (Apache Log4j) 16.0.3, 19.0.1 16.0.3 · 19.0.1
Oracle Retail Applications Installation (Apache Log4j) 21.0.0-25.0.0
Oracle Retail Applications Mathematical Operators (Apache Log4j) 13.2.8 13.2.8
Oracle Retail Applications NF Issuing (Apache Log4j) 14.2 14.2
Oracle Retail Applications Operations & Maintenance (Apache Log4j) 15.0, 16.0 15.0 · 16.0
Oracle Retail Applications PeopleSoft Integration (Apache Log4j) 16.0.3, 19.0.1 16.0.3 · 19.0.1
Oracle Retail Applications Point of Sale (Apache Log4j) 21.0.5-25.0.1
Oracle Retail Applications RIB Kernal (Apache Log4j) 16.0.3, 19.0.1 16.0.3 · 19.0.1
Oracle Retail Applications RSB Installation (Apache Log4j) 16.0.3, 19.0.1 16.0.3 · 19.0.1
Oracle Retail Applications Security (Apache Log4j) 16.0.3 16.0.3 · 19.0.1.44
Oracle Spatial Studio Install issues (Apache Log4j) 23.2.1, 24.2 23.2.1 · 24.2
Oracle Supply Chain CAX Client (Apache Log4j) 3.6 3.6
Oracle Supply Chain Installation Issues (Apache Log4j) 3.6.1 3.6.1
Oracle Utilities Applications Security (Apache Log4j) 4.3.0.6.0, 4.4.0.0.0, 4.4.0.2.0-4.4.0.4.0, 4.5.0.0.0, 4.5.0.1.1, 4.5.0.1.3, 4.5.0.2.0, 25.4, 25.10, 26.4 4.3.0.6.0 · 4.4.0.0.0 · 4.5.0.0.0 · 4.5.0.1.1 · 4.5.0.1.3 · 4.5.0.2.0 · 25.4 · 25.10 · 26.4
Oracle Utilities Applications Tools (Apache Log4j) 7.0.0.0.8, 7.0.0.1.7, 25.4.0.0.3 7.0.0.0.8 · 7.0.0.1.7 · 25.4.0.0.3

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.logging.log4j:log4j-core 2.7 2.25.4 unbounded
org.apache.logging.log4j:log4j-core 3.0.0-beta1 none 3.0.0-beta2

Products and versions

2 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd apache log4j generic ≥ 2.7 and ＜ 2.25.4 · 3.0.0:alpha1 · 3.0.0:alpha1_rc1 · 3.0.0:alpha1_rc2 · 3.0.0:beta1 · 3.0.0:beta2
osv org.apache.logging.log4j log4j-core generic ≥ 2.7 and ＜ 2.25.4 · ≥ 3.0.0 and ≤ 3.0.0

References

URLTags
https://github.com/apache/logging-log4j2/pull/4078 pr
https://github.com/apache/logging-log4j2 PACKAGE
https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on WEB
https://logging.apache.org/cyclonedx/vdr.xml WEB
https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html WEB
https://logging.apache.org/security.html#CVE-2026-34479 WEB
http://www.openwall.com/lists/oss-security/2026/04/10/8 WEB

Timeline
Published2026-04-10By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.