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 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) to open the malicious file. The scope is unchanged (S:U), and the impact is primarily on confidentiality (C:H), with no impact on integrity or availability. Although no public exploits are known, the vulnerability poses a risk to users who open untrusted EMF files embedded in PDFs or received via email or other channels. The lack of an available patch necessitates proactive mitigation. The vulnerability highlights a flaw in the EMF parsing logic, which fails to properly validate input sizes or boundaries before accessing memory, a common issue in complex file format processing. Organizations relying on PDF-XChange Editor for document handling should be aware of this risk and implement controls to prevent exploitation.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive information, including potentially confidential business data or personally identifiable information, if malicious EMF files are opened. Sectors such as finance, legal, government, and healthcare, which frequently handle sensitive PDF documents, are particularly at risk. The medium severity rating indicates a moderate risk, but the ease of exploitation through user interaction means phishing or social engineering campaigns could be effective attack vectors. The confidentiality breach could result in regulatory non-compliance under GDPR if personal data is exposed. While the vulnerability does not affect system integrity or availability, the loss of confidentiality can have significant reputational and financial consequences. The lack of known exploits currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability becomes widely known.

1. Immediately restrict the opening of EMF files from untrusted or unknown sources within PDF documents. 2. Educate users to be cautious about opening PDF files, especially those received via email or downloaded from unverified websites. 3. Implement email filtering and sandboxing solutions to detect and block malicious PDFs containing crafted EMF files. 4. Monitor vendor communications closely for patches or updates addressing this vulnerability and apply them promptly once available. 5. Consider deploying endpoint detection and response (EDR) tools capable of identifying anomalous behavior related to PDF processing. 6. Use application whitelisting or sandboxing for PDF-XChange Editor to limit potential damage from exploitation. 7. Review and tighten document handling policies to reduce exposure to malicious files. 8. If feasible, temporarily switch to alternative PDF readers with no known vulnerabilities in EMF processing until a patch is released.