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CVE-2026-88789 – XXE Injection (Local File Read / SSRF) – Apache Camel Quarkus 3.2.0–3.33.2 and 3.34

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Summary

CVE-2026-88789 is an Improper Restriction of XML External Entity Reference (XXE) vulnerability in the XSLT support extension of Apache Camel Quarkus (camel-quarkus-support-xalan). An attacker who can supply the XML document being transformed can read local files or issue requests to internal network locations via external entity declarations. The flaw carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: camel-quarkus-support-xalan supplies its own Xalan-backed TransformerFactory to the xslt component and registers it as the JAXP default.
  • Xalan-J 2.7.x predates JAXP 1.5 and does not honor javax.xml.XMLConstants.ACCESS_EXTERNAL_DTD or ACCESS_EXTERNAL_STYLESHEET, so the external-access restrictions Apache Camel normally applies to its TransformerFactory are not in effect.
  • Trigger conditions: on the xslt component path, the issue affects message bodies that reach the transformer already as a javax.xml.transform.Source. Bodies of other types (String, byte[], InputStream) are converted by Apache Camel to a SAXSource with external entities and external DTD loading disabled, and are not affected.
  • Because the vulnerable factory is also registered as the JAXP default, any other code in the application that obtains a TransformerFactory via TransformerFactory.newInstance() silently loses the same restrictions.
  • Attack vector: network — an attacker supplies a crafted XML document (containing an external entity declaration) that is processed by the affected transformer.
  • Impact: disclosure of local files and the ability to issue requests to internal network resources (SSRF-style access), with no impact on integrity or availability.

Affected software

  • Apache Camel Quarkus 3.2.0 through 3.33.2 (inclusive)
  • Apache Camel Quarkus 3.34.0 through 3.39.x (inclusive)
  • Affected when any of the following extensions are on the classpath: camel-quarkus-xslt, camel-quarkus-xslt-saxon, camel-quarkus-tika, camel-quarkus-xmlsecurity (the latter three are exposed only through the JAXP default factory, not direct XSLT transformation)

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade to Apache Camel Quarkus 3.33.3 (LTS branch) or 3.40.0 (current branch), which fix the issue.
  • If immediate upgrade is not possible:
    • Avoid passing untrusted javax.xml.transform.Source objects directly to xslt endpoints; instead supply message bodies as String, byte[], or InputStream so Apache Camel converts them to a SAXSource with external entity and external DTD loading disabled.
    • Where application code relies on JAXP’s default TransformerFactory.newInstance(), explicitly request the JDK implementation (com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl) rather than relying on the default lookup, to avoid picking up the vulnerable Xalan-backed factory.

References

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