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CVE-2026-34479 is an output-escaping vulnerability in Log4j1XmlLayout within the Apache Log4j 1-to-Log4j 2 bridge. The layout fails to escape characters forbidden by XML 1.0, generating malformed XML log output. Conforming XML parsers reject documents containing these characters with a fatal error, potentially causing downstream log-processing systems to discard or fail to index affected records. Affected versions are 2.7 through versions before 2.25.4, and 3.0.0-alpha1 through 3.0.0-beta2. Vulnerable configurations use Log4j1XmlLayout directly in Log4j Core 2 or select org.apache.log4j.xml.XMLLayout through the Log4j 1 configuration compatibility layer.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Log4j 1-to-Log4j 2 bridge XML-layout flaw that can emit malformed XML containing forbidden XML 1.0 characters. Conforming downstream XML parsers may reject the records, causing log-processing systems to drop or fail to index affected logs.
A remotely exploitable, low-complexity vulnerability with no required privileges or user interaction that can cause high integrity impact, according to the listed CVSS v3.0 metrics.
A network-accessible, low-complexity vulnerability requiring no privileges or user interaction that can have a high integrity impact. The supplied content does not identify the affected component or provide further technical details.
A vulnerability in Oracle Communications addressed as part of a consolidated fix bundled with CVE-2026-34481.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.