CVE-2026-25992: Path Traversal in SiYuan Kernel

Successful exploitation of CVE-2026-25992 allows an attacker to read arbitrary files accessible to the SiYuan process. This could include configuration files containing database credentials, user data, or other sensitive information. Depending on the server's configuration and file permissions, an attacker might be able to access the entire filesystem. While the vulnerability doesn't directly lead to remote code execution, the information gained could be used to further compromise the system or launch other attacks. The potential impact is significant, particularly if the server hosts sensitive data or is part of a larger network.

1. Reserved2026-02-09
2. Published2026-02-02
3. Modified2026-02-10
4. EPSS updated2026-03-23

The primary mitigation for CVE-2026-25992 is to upgrade SiYuan Kernel to version 3.5.5 or later. If an immediate upgrade is not possible due to compatibility issues or downtime constraints, consider implementing stricter file access controls on the server to limit the potential damage from a successful exploit. Review and harden file permissions to ensure that the SiYuan process only has access to the files it absolutely needs. While a WAF or proxy cannot directly prevent this type of path traversal, it can be configured to monitor for suspicious file access patterns and block requests that attempt to access files outside of the expected directories.