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CVE-2026-48055 is a Zip Slip/path traversal vulnerability in Streambert, a cross-platform Electron desktop application for streaming and downloading video media. Streambert 2.4.0 and earlier fail to sanitize ZIP archive entry filenames during subtitle archive extraction. The vulnerable logic constructs the extraction destination path by concatenating the temporary directory path with the raw archive entry name (for example, extracted.name) without validating or normalizing traversal sequences. A malicious ZIP archive containing entries with ../ style path traversal can therefore escape the intended temporary extraction directory and cause files to be written to attacker-chosen locations on the host filesystem, subject to the application's effective write permissions.
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