Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: * JRE built-in StAX: Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must reject such documents with a fatal error, which may cause downstream log-processing systems to drop the affected records. * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging call, and the log event is never delivered to its intended appender, only to Log4j's internal status logger. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing forbidden characters before XML output.

The 13.5 and 24.1 versions of Enterprise Manager Base Platform installed on the remote host are affected by multiple vulnerabilities as referenced in the June 2026 CSPU advisory.

  - Vulnerability in the Oracle Enterprise Manager Base Platform product of Oracle Enterprise Manager     (component: Target Management). Supported versions that are affected are 13.5 and 24.1. Easily     exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise     Oracle Enterprise Manager Base Platform. While the vulnerability is in Oracle Enterprise Manager Base     Platform, attacks may significantly impact additional products (scope change). Successful attacks of this     vulnerability can result in takeover of Oracle Enterprise Manager Base Platform. (CVE-2026-46854)

  - Vulnerability in the Oracle Enterprise Manager Base Platform product of Oracle Enterprise Manager     (component: Discovery Framework). Supported versions that are affected are 13.5 and 24.1. Easily     exploitable vulnerability allows low privileged attacker with network access via HTTPS to compromise     Oracle Enterprise Manager Base Platform. While the vulnerability is in Oracle Enterprise Manager Base     Platform, attacks may significantly impact additional products (scope change). Successful attacks of this     vulnerability can result in takeover of Oracle Enterprise Manager Base Platform. (CVE-2026-46832)

  - Vulnerability in the Oracle Enterprise Manager Base Platform product of Oracle Enterprise Manager     (component: Metadata Plugin). Supported versions that are affected are 13.5 and 24.1. Easily exploitable     vulnerability allows low privileged attacker with network access via HTTPS to compromise Oracle Enterprise     Manager Base Platform. While the vulnerability is in Oracle Enterprise Manager Base Platform, attacks may     significantly impact additional products (scope change). Successful attacks of this vulnerability can     result in takeover of Oracle Enterprise Manager Base Platform. (CVE-2026-46852)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1843-1 advisory.

    - CVE-2026-34477: TLS connections vulnerable to interception due to incomplete hostname verification     configuration       checks (bsc#1262050).
    - CVE-2026-34479: silent log event loss due to improper XML escaping in `Log4j1XmlLayout` (bsc#1262091).
    - CVE-2026-34480: silent log event loss due to improper XML escaping in `XmlLayout` (bsc#1262092).
    - CVE-2026-34481: silent log event loss due to improper serialization of non-finite floating-point values     in       `JsonTemplateLayout` (bsc#1262093).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Apache Log4j on the remote host is 2.0-alpha1 through 2.25.3. It is, therefore, affected by a vulnerability:

  - The XmlLayout fails to sanitize characters forbidden by the XML 1.0 specification, producing invalid XML     output whenever a log message or MDC value contains such characters. Depending on the StAX implementation,     this causes either malformed XML or exceptions during logging. (CVE-2026-34480)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in     versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification     https://www.w3.org/TR/xml/#charsets producing invalid XML output whenever a log message or MDC value     contains such characters. The impact depends on the StAX implementation in use: * JRE built-in StAX:
    Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must     reject such documents with a fatal error, which may cause downstream log-processing systems to drop the     affected records. * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox     , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging     call, and the log event is never delivered to its intended appender, only to Log4j's internal status     logger. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing     forbidden characters before XML output. (CVE-2026-34480)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
321531	Oracle Enterprise Manager Cloud Control (June 2026 CSPU)	Nessus	Misc.	medium
315047	SUSE SLED15 / SLES15 Security Update : log4j (SUSE-SU-2026:1843-1)	Nessus	SuSE Local Security Checks	medium
306549	Apache Log4j 2.0-alpha1 < 2.25.4 XmlLayout Invalid XML Output (CVE-2026-34480)	Nessus	Misc.	medium
306043	Linux Distros Unpatched Vulnerability : CVE-2026-34480	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-34480

medium

Tenable Plugins

medium

medium

medium

medium