CVE-2026-34479

medium Red Hat
CVSS v3 Base Score
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS Score
0.1%
Exploitation probability in 30 days
Top 69% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Published: April 10, 2026 (91 days ago)
Last Modified: April 10, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in the Apache Log4j 1-to-Log4j 2 bridge. The Log4j1XmlLayout component fails to properly escape characters forbidden by the XML 1.0 standard. This improper handling of characters results in malformed XML output, which can cause downstream log processing systems to drop or fail to index affected records. The primary consequence is a denial of service for log analysis, potentially hindering security monitoring and incident response.

CWE

CWE-91

Affected Products

Red Hat Data Grid 8Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9Red Hat Fuse 7Red Hat JBoss Enterprise Application Platform 7Red Hat JBoss Enterprise Application Platform 8Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat Offline Knowledge PortalRed Hat OpenShift AI (RHOAI)streams for Apache Kafka 3

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 lists.apache.org