CVE-2025-58113 is a medium severity vulnerability classified under CWE-125 (Out-of-bounds Read) affecting PDF-XChange Editor version 10.7.3.401, specifically in its Enhanced Metafile (EMF) processing functionality. The vulnerability arises when the application processes a specially crafted EMF file, causing it to read memory beyond the allocated buffer boundaries. This out-of-bounds read does not allow code execution or modification of data but can lead to the unintended disclosure of sensitive information residing in adjacent memory areas. The attack vector is network-based (AV:N), requiring no privileges (PR:N) but does require user interaction (UI:R), such as opening a malicious file. The scope is unchanged (S:U), meaning the impact is limited to the vulnerable application context. The confidentiality impact is high (C:H), while integrity and availability impacts are none (I:N, A:N). No patches or exploits are currently publicly available, but the vulnerability is documented and published as of December 2025. The vulnerability is significant because PDF-XChange Editor is widely used for document viewing and editing, and EMF files are a common vector for embedding graphical content. Attackers could leverage this flaw to extract sensitive data from memory, potentially including user credentials, cryptographic keys, or other confidential information processed by the application. The lack of authentication requirements and low attack complexity increase the risk, especially in environments where users frequently open untrusted documents.

For European organizations, the primary impact of CVE-2025-58113 is the potential leakage of sensitive information through memory disclosure. This can compromise confidentiality of internal documents, user credentials, or cryptographic material handled by PDF-XChange Editor. Sectors such as finance, legal, government, and healthcare, which often process sensitive PDF documents, are particularly at risk. The vulnerability could be exploited via phishing campaigns or malicious document distribution, leading to data breaches or espionage. Although the vulnerability does not allow code execution or system compromise, the information disclosure could facilitate further attacks or unauthorized access. The requirement for user interaction means that user awareness and training can mitigate risk, but the widespread use of PDF-XChange Editor in European enterprises increases the attack surface. Additionally, the absence of a patch at the time of disclosure means organizations must rely on interim mitigations, increasing exposure duration. The impact on availability and integrity is negligible, but confidentiality breaches can have severe regulatory and reputational consequences under GDPR and other European data protection laws.

1. Monitor PDF-XChange Co. Ltd communications and security advisories closely to apply patches immediately once released for version 10.7.3.401. 2. Until a patch is available, restrict the opening of EMF files or untrusted PDF documents containing embedded EMF content through application whitelisting or file type filtering at email gateways and endpoint security solutions. 3. Employ sandboxing or isolated environments for opening documents from untrusted sources to contain potential memory disclosure. 4. Educate users to avoid opening suspicious or unsolicited PDF files, especially those containing embedded graphics or EMF content. 5. Use endpoint detection and response (EDR) tools to monitor for anomalous application behavior related to PDF-XChange Editor. 6. Consider deploying application control policies that limit the use of vulnerable PDF-XChange Editor versions or replace it with alternative PDF readers with better security track records. 7. Implement network-level protections such as email attachment scanning and URL filtering to reduce the risk of malicious document delivery. 8. Conduct regular audits of software inventory to identify and remediate vulnerable versions promptly.