CVE-2026-49833

Overview A path traversal vulnerability is possible via the COAR Notify / LDN service in DSpace. _This vulnerability impacts DSpace versions 8.0 <= 8.3, 9.0 <= 9.2._ The attacker MUST already have DSpace administrator credentials in order to perform the attack. When reading a file input stream of an "inbound pattern" / "template", used to generate an LDN message, the LDN class does not check for path traversal or restrict the templates to a known base path. This could allow an untrusted file from elsewhere in the file system (e.g. an export log, a bitstream path, a temporary file) to be read and interpreted as an Apache Velocity template. Expected behaviour : Only the trusted templates kept in $dspace.dir/config/ldn should be allowed or used by LDN. Impact On its own this seems a fairly low-impact problem: only DSpace Administrators can set LDN template names in services, and you typically need more access to manipulate files on the server. However, this vulnerability was included as part of an attack chain that demonstrated the ability of a DSpace Administrator to put the malicious Velocity payload in a predictable place (e.g. temporary log file from a running process) and then have that file referenced as the template name in a new service. This means it is possible (non-trivial, but proven) for an attacker with DSpace administrator credentials to either disclose information via a specially crafted Velocity template, or exploit another weakness in the DSpace Velocity implementation by executing arbitrary java code. Patches The fix is included in DSpace 8.4, 9.3 and 10.0. Please upgrade to one of these versions or disable LDN (see below) If users cannot upgrade immediately, it is possible to manually patch their DSpace backend. (No changes are necessary to the frontend.) A pull request exists which can be used to patch systems running DSpace 8.x or 9.x. - Pull request for 9.x: https://github.com/DSpace/DSpace/pull/12552 (Downloadable patch file) - This 9.

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