CVE-2026-127031
Eclipse AAS4J XML External Entity Injection
Description
In Eclipse AAS4J before 3.0.1, `XmlSchemaValidator.validateSchema()` (and `AASXValidator.validateSchema()`, which calls it) validates untrusted XML with a default JAXP `Validator` that resolves external DTDs and external entities. An attacker who supplies a crafted AAS XML document or AASX package can read local files from the host, send their contents out-of-band to an attacker-controlled server, and make the validating process send arbitrary outbound requests (SSRF). Validation still returns no errors. Details: - Vulnerable code: `dataformat-xml/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/xml/XmlSchemaValidator.java`. `schema.newValidator().validate(new StreamSource(...))` runs without `ACCESS_EXTERNAL_DTD` / `ACCESS_EXTERNAL_SCHEMA` restrictions and without `disallow-doctype-decl`. - Second entry point: `dataformat-aasx/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/aasx/AASXValidator.java`. The AAS XML part of an `.aasx` package is passed unchanged to the vulnerable validator. - `XmlDeserializer` (Jackson/Woodstox) is not affected, because DTD support is disabled by default there. - Present since the initial import of the code base (commit `cc9da52`). - Fix: harden the validator by setting `ACCESS_EXTERNAL_DTD` and `ACCESS_EXTERNAL_SCHEMA` to `""` and rejecting `DOCTYPE` declarations. The bundled `AAS.xsd` does not need DTDs, so no functionality is lost.
INFO
Published Date :
Nov. 13, 2026, 2:28 p.m.
Last Modified :
Nov. 13, 2026, 2:31 p.m.
Remotely Exploit :
Yes !
Source :
eclipse
Affected Products
The following products are affected by CVE-2026-127031
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | e51fbebd-6053-4e49-959f-1b94eeb69a2c |
Solution
- Update Eclipse AAS4J to version 3.0.1 or later.
- Apply validator hardening for external DTDs and schemas.
- Reject DOCTYPE declarations in XML processing.
- Ensure schema validation restricts external entity access.
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CVE-2026-127031 vulnerability anywhere in the article.