CVE-2026-127031

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.

• https://github.com/eclipse-aas4j/aas4j
• https://github.com/eclipse-aas4j/aas4j/blob/main/dataformat-xml/src/main/java/org/eclipse/digitaltwin/aas4j/v3/dataformat/xml/XmlSchemaValidator.java
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/571

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-12701A path traversal vulnerability was found in pulpcore. The re…9
• CVE-2026-127016The MISP Modules website component exposes external tool man…9.2
• CVE-2026-12702In affected versions of Octopus Deploy Insufficient checks o…4.9
• CVE-2026-127029A flaw was found in freeradius's Extensible Authentication P…7.5
• CVE-2026-12703TeamViewer Full Client and Host for macOS before version 15.…8
• CVE-2026-127030A flaw was found in freeradius. An improper length validatio…7.5
• CVE-2026-127036Improper neutralization of CRLF sequences ('CRLF injection')…8.6
• CVE-2026-12704When SAML IdP-initiated login is enabled in Grafana Enterpri…6.8
• CVE-2026-127046The MISP Modules website component contains an information d…9.2
• CVE-2026-12705Missing support for integrity check vulnerability in ABB KNX…6.4
• CVE-2026-127050Backup Migration before 2.1.8 for WordPress contains a path …6.4
• CVE-2026-127056PapaParse before 5.7.1 contains an inefficient algorithmic c…7.5