# org.apache.logging.log4j:log4j-core (Maven) vulnerabilities

Source: https://junglewise.ai/threats/technologies/org-apache-logging-log4j-log4j-core  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/org-apache-logging-log4j-log4j-core.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 11 vulnerabilities in org.apache.logging.log4j:log4j-core (Maven): 0 in the last 7 days and 0 in the last 90 days, 2 of them critical and 2 exploited in the wild. The most recent, CVE-2026-34480, was published on 10 April 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 11 (2 critical, 2 exploited in the wild)

## About org.apache.logging.log4j:log4j-core (Maven)

Core logging framework for Java applications with multiple appender types.

## Latest org.apache.logging.log4j:log4j-core (Maven) vulnerabilities

- [CVE-2026-34480: Apache Log4j Core invalid XML output in XmlLayout](https://junglewise.ai/threats/cve-2026-34480-apache-log4j-core-invalid-xml-output-in-xmllayout) (high, CVSS 7.5, published 10 Apr 2026)
- [CVE-2026-34478: Apache Log4j Core log injection in Rfc5424Layout](https://junglewise.ai/threats/cve-2026-34478-apache-log4j-core-log-injection-in-rfc5424layout) (high, CVSS 7.5, published 10 Apr 2026)
- [CVE-2026-34477: Apache Log4j Core improper certificate validation in network appenders](https://junglewise.ai/threats/cve-2026-34477-apache-log4j-core-improper-certificate-validation-in-network) (medium, CVSS 5.9, published 10 Apr 2026)
- [CVE-2025-68161: Apache Log4j does not verify the TLS hostname in its Socket Appender](https://junglewise.ai/threats/cve-2025-68161-apache-log4j-does-not-verify-the-tls-hostname-in-its-socket) (medium, CVSS 4, published 18 Dec 2025)
- [CVE-2023-26464: Apache Log4j 1.x (EOL) allows Denial of Service (DoS)](https://junglewise.ai/threats/cve-2023-26464-apache-log4j-1-x-eol-allows-denial-of-service-dos) (low, CVSS 3.1, published 10 Mar 2023)
- [CVE-2021-44832: Apache Log4j2 remote code execution via JDBC Appender JNDI injection](https://junglewise.ai/threats/cve-2021-44832-apache-log4j2-remote-code-execution-via-jdbc-appender-jndi) (medium, CVSS 6.6, published 4 Jan 2022)
- [CVE-2021-45105: Apache Log4j2 uncontrolled recursion in self-referential lookups](https://junglewise.ai/threats/cve-2021-45105-apache-log4j2-uncontrolled-recursion-in-self-referential-lookups) (high, CVSS 8.6, published 18 Dec 2021)
- [CVE-2021-45046: Incomplete fix for Apache Log4j vulnerability](https://junglewise.ai/threats/cve-2021-45046-apache-log4j2-deserialization-of-untrusted-data-vulnerability) (critical, exploited in the wild, CVSS 9, published 14 Dec 2021)
- [CVE-2021-44228: Remote code injection in Log4j](https://junglewise.ai/threats/cve-2021-44228-apache-log4j2-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 3.1, published 10 Dec 2021)
- [CVE-2020-9488: Apache Log4j improper certificate validation in SMTP appender](https://junglewise.ai/threats/cve-2020-9488-apache-log4j-improper-certificate-validation-in-smtp-appender) (low, CVSS 3.7, published 5 Jun 2020)
- [CVE-2017-5645: Deserialization of Untrusted Data in Log4j](https://junglewise.ai/threats/cve-2017-5645-deserialization-of-untrusted-data-in-log4j) (low, CVSS 3, published 6 Jan 2020)

## Most severe org.apache.logging.log4j:log4j-core (Maven) vulnerabilities

- [CVE-2021-45046: Incomplete fix for Apache Log4j vulnerability](https://junglewise.ai/threats/cve-2021-45046-apache-log4j2-deserialization-of-untrusted-data-vulnerability) (critical, exploited in the wild, CVSS 9, published 14 Dec 2021)
- [CVE-2021-44228: Remote code injection in Log4j](https://junglewise.ai/threats/cve-2021-44228-apache-log4j2-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 3.1, published 10 Dec 2021)
- [CVE-2021-45105: Apache Log4j2 uncontrolled recursion in self-referential lookups](https://junglewise.ai/threats/cve-2021-45105-apache-log4j2-uncontrolled-recursion-in-self-referential-lookups) (high, CVSS 8.6, published 18 Dec 2021)
- [CVE-2026-34480: Apache Log4j Core invalid XML output in XmlLayout](https://junglewise.ai/threats/cve-2026-34480-apache-log4j-core-invalid-xml-output-in-xmllayout) (high, CVSS 7.5, published 10 Apr 2026)
- [CVE-2026-34478: Apache Log4j Core log injection in Rfc5424Layout](https://junglewise.ai/threats/cve-2026-34478-apache-log4j-core-log-injection-in-rfc5424layout) (high, CVSS 7.5, published 10 Apr 2026)
- [CVE-2021-44832: Apache Log4j2 remote code execution via JDBC Appender JNDI injection](https://junglewise.ai/threats/cve-2021-44832-apache-log4j2-remote-code-execution-via-jdbc-appender-jndi) (medium, CVSS 6.6, published 4 Jan 2022)
- [CVE-2026-34477: Apache Log4j Core improper certificate validation in network appenders](https://junglewise.ai/threats/cve-2026-34477-apache-log4j-core-improper-certificate-validation-in-network) (medium, CVSS 5.9, published 10 Apr 2026)
- [CVE-2025-68161: Apache Log4j does not verify the TLS hostname in its Socket Appender](https://junglewise.ai/threats/cve-2025-68161-apache-log4j-does-not-verify-the-tls-hostname-in-its-socket) (medium, CVSS 4, published 18 Dec 2025)
- [CVE-2020-9488: Apache Log4j improper certificate validation in SMTP appender](https://junglewise.ai/threats/cve-2020-9488-apache-log4j-improper-certificate-validation-in-smtp-appender) (low, CVSS 3.7, published 5 Jun 2020)
- [CVE-2023-26464: Apache Log4j 1.x (EOL) allows Denial of Service (DoS)](https://junglewise.ai/threats/cve-2023-26464-apache-log4j-1-x-eol-allows-denial-of-service-dos) (low, CVSS 3.1, published 10 Mar 2023)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

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- [org.apache.struts:struts2-core (Maven)](https://junglewise.ai/threats/technologies/org-apache-struts-struts2-core): 60 vulnerabilities
- [org.keycloak:keycloak-core (Maven)](https://junglewise.ai/threats/technologies/org-keycloak-keycloak-core): 57 vulnerabilities
- [org.xwiki.platform:xwiki-platform-oldcore (Maven)](https://junglewise.ai/threats/technologies/org-xwiki-platform-xwiki-platform-oldcore): 46 vulnerabilities
- [org.apache.tomcat:tomcat-catalina (Maven)](https://junglewise.ai/threats/technologies/org-apache-tomcat-tomcat-catalina): 44 vulnerabilities
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## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "org.apache.logging.log4j:log4j-core (Maven) vulnerabilities", https://junglewise.ai/threats/technologies/org-apache-logging-log4j-log4j-core, 9 November 2026.