# Apache Software Foundation Log4j Core vulnerabilities

Source: https://junglewise.ai/threats/technologies/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/log4j-core.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Apache Software Foundation Log4j Core: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 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: 3 (0 critical, 0 exploited in the wild)

## About Apache Software Foundation Log4j Core

Core logging library for Apache Log4j framework.

## Latest Apache Software Foundation Log4j Core 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-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-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)

## Most severe Apache Software Foundation Log4j Core 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-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-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)

## 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 |

## Other Apache Software Foundation technologies

- [Apache Software Foundation IoTDB](https://junglewise.ai/threats/technologies/iotdb): 13 vulnerabilities
- [Apache Software Foundation Apache CXF](https://junglewise.ai/threats/technologies/cxf): 10 vulnerabilities
- [Apache Software Foundation HTTP Server](https://junglewise.ai/threats/technologies/apache-software-foundation-http-server): 8 vulnerabilities
- [Apache Software Foundation ActiveMQ All](https://junglewise.ai/threats/technologies/activemq-all): 7 vulnerabilities
- [Apache Software Foundation Answer](https://junglewise.ai/threats/technologies/answer): 7 vulnerabilities
- [Apache Software Foundation Dolphinscheduler](https://junglewise.ai/threats/technologies/dolphinscheduler): 6 vulnerabilities
- [Apache Software Foundation NimBLE](https://junglewise.ai/threats/technologies/nimble): 6 vulnerabilities
- [Apache Software Foundation JSPWiki](https://junglewise.ai/threats/technologies/jspwiki): 5 vulnerabilities
- [Apache Software Foundation Apache Kvrocks](https://junglewise.ai/threats/technologies/kvrocks): 5 vulnerabilities
- [Apache Software Foundation NiFi](https://junglewise.ai/threats/technologies/nifi): 5 vulnerabilities
- [Apache Software Foundation Apache Wicket](https://junglewise.ai/threats/technologies/wicket): 5 vulnerabilities
- [Apache Software Foundation Gravitino](https://junglewise.ai/threats/technologies/gravitino): 4 vulnerabilities

## 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, "Apache Software Foundation Log4j Core vulnerabilities", https://junglewise.ai/threats/technologies/log4j-core, 9 November 2026.