CVE-2026-63500 in Yeti
Summary
by MITRE • 11/03/2026
Yeti bridges the gap between CTI and DFIR practitioners by providing a Forensics Intelligence platform and pipeline. Prior to 2.5.1, core/schemas/dfiq.py accepts an unvalidated uuid from DFIQ YAML through POST /api/v2/dfiq/from_yaml, and core/web/apiv2/dfiq.py later interpolates that stored value into an archive filesystem path in POST /api/v2/dfiq/to_archive. A low-privileged authenticated user can import a DFIQ object whose UUID contains traversal sequences and trigger archive export, causing attacker-controlled content with a .yaml suffix to be written outside the intended temporary archive directory. The impact is limited by paths writable by the YETI service account, and the separate DFIQ archive-import zip-slip candidate is not part of this vulnerability. This issue is fixed in version 2.5.1.
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Analysis
by VulDB Data Team • 11/03/2026
The Yeti platform serves as a critical bridge between Cyber Threat Intelligence (CTI) and Digital Forensics and Incident Response (DFIR) practitioners by offering a centralized forensics intelligence pipeline. Within this architecture, the handling of DFIQ objects through specific API endpoints represents a high-value attack surface due to its interaction with file system operations. Prior to version 2.5.1, the application contained a significant path traversal vulnerability rooted in insufficient input validation and unsafe string interpolation during archive export processes. This flaw allows an attacker to manipulate filesystem paths, potentially leading to unauthorized file writes outside of intended directories.
The technical root cause lies in the handling of UUID values within DFIQ YAML imports. When a user submits data via the POST /api/v2/dfiq/from_yaml endpoint, the core/schemas/dfiq.py module accepts and stores a UUID value without performing adequate validation to ensure it conforms to standard alphanumeric formats or excludes directory traversal sequences such as dot-dot-slash characters. This unvalidated input is subsequently retrieved and used in the POST /api/v2/dfiq/to_archive endpoint within core/web/apiv2/dfiq.py. Here, the stored UUID is directly interpolated into an archive filesystem path without sanitization. Consequently, if a malicious actor crafts a DFIQ object containing traversal sequences within its UUID field, they can influence the destination path where files are written during the export process.
The operational impact of this vulnerability is significant for organizations relying on Yeti for secure forensic data management. A low-privileged authenticated user can exploit this flaw to write attacker-controlled content with a .yaml suffix outside the designated temporary archive directory. This capability effectively constitutes an arbitrary file write vulnerability, which falls under CWE-22: Improper Limitation of a Pathname to a Restricted Directory. By writing files to unexpected locations, an attacker may achieve several malicious outcomes depending on the permissions granted to the YETI service account. These potential impacts include overwriting critical configuration files, planting web shells if writable directories are accessible via HTTP, or disrupting forensic integrity by corrupting expected data structures. The severity is somewhat mitigated by the fact that write operations are limited to paths accessible by the specific YETI service account, and this vulnerability does not extend to other archive-import mechanisms like zip-slip candidates mentioned in related advisories.
To mitigate this risk, organizations must immediately upgrade to Yeti version 2.5.1 or later, where the input validation logic has been strengthened to reject non-compliant UUIDs containing traversal sequences. In addition to upgrading, security teams should enforce strict least-privilege principles for the YETI service account, ensuring it does not have write access to sensitive system directories or web-accessible locations unless absolutely necessary. Furthermore, implementing Web Application Firewall rules that detect and block common path traversal patterns in API payloads can provide an additional layer of defense-in-depth while patching efforts are underway. This vulnerability aligns with MITRE ATT&CK technique T1564: Host File System Indicator Removal on Impact, as it allows for the manipulation of file system artifacts to obscure malicious activity or disrupt forensic investigations.