CVE-2026-113582: CWE-611 Improper Restriction of XML External Entity Reference in Apache Software Foundation Apache Abdera

CVE-2026-113582 is an XML External Entity (XXE) vulnerability in Apache Abdera, a retired Apache Software Foundation project. The vulnerability arises from improper restriction of XML external entity references, enabling attackers to access sensitive information or trigger server-side requests by submitting malicious XML to the Abdera parser. Since Apache Abdera is no longer maintained, no patches or official fixes will be provided. Users should migrate to supported alternatives or block untrusted XML inputs from reaching the vulnerable components. Downstream products embedding Abdera may also be affected if they include the vulnerable artifact.

Successful exploitation can lead to unauthorized access to sensitive data or the ability to make server-side requests, potentially compromising confidentiality and integrity of the affected system. Since the vulnerability requires processing attacker-controlled XML, systems that parse such input with Abdera are at risk. No known exploits are reported in the wild. The vulnerability affects all versions of Apache Abdera, which is no longer supported.

No official fix or patch is available because Apache Abdera is retired and unsupported. Users should migrate to actively maintained alternatives. For applications that cannot migrate immediately, it is critical to ensure that untrusted XML input cannot reach the Abdera parser or JDBC adapter parsing paths. Downstream products that include Abdera should verify whether they are affected and apply similar mitigations.