tarfile.data_filter path traversal bypass allows writing outside the extraction directory

CVE-2026-7774

What is CVE-2026-7774?

tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.

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