BusyBox tar arbitrary file overwrite via unsafe hardlink resolution
CVE-2026-124745 Published on November 11, 2026
Busybox: tar deferred hardlink target resolved through a deferred symlink escapes the extraction directory
A flaw was found in BusyBox. When extracting an archive, the tar utility improperly resolves deferred hardlink targets across symbolic links pointing outside the intended extraction directory. An attacker could provide a specially crafted archive that links to sensitive files outside the extraction tree, allowing subsequent extraction operations to overwrite arbitrary files on the system.
Vulnerability Analysis
CVE-2026-124745 can be exploited with local system access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Timeline
Reported to Red Hat.
Made public. 17 days later.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-124745 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-124745
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