CVE-2026-34481 Apache Log4j
| Affected software | Apache Log4j |
|---|---|
| Severity | 6.3 Medium CVSS 4.0 2 scores |
| Fixed in | 2.25.4 |
| Weakness | CWE-116 |
| Published | 10 Apr 2026 |
| Updated | 26 Oct 2026 |
Description
Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records. An attacker can exploit this issue only if both of the following conditions are met: * The application uses JsonTemplateLayout. * The application logs a MapMessage, or logs an object directly (e.g., via Logger.info(Object), which wraps it in an ObjectMessage), where the message contains an attacker-controlled floating-point value. Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue. Note: The fix released in version 2.25.4 did not cover all affected code paths. CVE-2026-49844 was assigned to the remaining issue, which concerns the MapMessage.asJson() serialization in Apache Log4j API and is fixed in versions 2.25.5 and 2.26.1.
Exploitation status
No public exploit
No exploit has been reported in the sources we check.
Exploitation status
- CISA KEV not listed
- VulnCheck KEV not listed
- CISA Vulnrichment exploitation: none
- Indexed PoC none indexed
- EPSS 0.72% chance in 30 days
Waratek protection
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 #4080.
- 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/4080 : a pull request: the change under review |
CVSS
6.3 MEDIUM
v4.0 CVSS:4.0/AV:N/AC:H/AT:P/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
CVSS
6.3 MEDIUM v4.0CVSS:4.0/AV:N/AC:H/AT:P/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.
| Version | Score | Band | Vector | Assigner | Type | |
|---|---|---|---|---|---|---|
| CVSS 4.0 | 6.3 | MEDIUM | CVSS:4.0/AV:N/AC:H/AT:P/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
| Advisory | Type | Quarter | Products 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 / Install (Apache Log4j) (24.2.5) Oracle Communications / Install (Apache Log4j) (25.2.200) Oracle Communications / Install (Apache Log4j) (25.2.200) Oracle Communications / Install (Apache Log4j) (25.2.200) Oracle Communications / Install (Apache Log4j) (25.200) 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 / 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 / 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 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 / 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 Retail Applications / Operations & Maintenance (Apache Log4j) (15.0, 16.0) Oracle Supply Chain / CAX Client (Apache Log4j) (3.6) |
| 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
| Family | Component | Versions, as Oracle lists them | Read 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 | Install (Apache Log4j) | 24.2.5 | 24.2.5 · 25.2.200 · 25.200 |
| 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 | 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 | 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 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| Package | Introduced | Fixed | Last affected |
|---|---|---|---|
org.apache.logging.log4j:log4j-layout-template-json |
2.14.0 | 2.25.4 |
unbounded |
org.apache.logging.log4j:log4j-layout-template-json |
3.0.0-alpha1 | none | 3.0.0-beta3 |
Products and versions
2 products, 9 version entries| Source | Vendor | Product | Scheme | Affected versions |
|---|---|---|---|---|
| nvd | apache | log4j | generic | ≥ 2.14.0 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 · 3.0.0:beta3 |
| osv | org.apache.logging.log4j | log4j-layout-template-json | generic | ≥ 2.14.0 and ＜ 2.25.4 · ≥ 3.0.0 and ≤ 3.0.0 |
References
Timeline
Timeline
| Published | 2026-04-10 | By the CVE Program. |
|---|---|---|
| NVD record modified | 2026-10-26 | NVD's own last-modified date for this record. |