CVE-2026-62268

Description

borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. Prior to 1.4.5 and 2.0.0b22, extracting a malicious archive can follow a symlinked parent path or resolve embedded dot-dot path components and delete or overwrite files outside the extraction directory. A crafted slave hardlink can also use an attacker-controlled hardlink source outside the extraction directory and hard-link that file into the restored tree, disclosing its contents. Creating the malicious archive requires repository access and, for encrypted or authenticated repositories, the Borg key and passphrase; a victim must then extract the archive. This issue is fixed in versions 1.4.5 and 2.0.0b22.

References

• https://github.com/borgbackup/borg/commit/0ac568e290518c3bbe781459978720dde7fab224
• https://github.com/borgbackup/borg/commit/141888f2fabcd57a300547c2aa63212cb213924d
• https://github.com/borgbackup/borg/commit/2d632531028b09da8ab5d1450f89bebcc205d640
• https://github.com/borgbackup/borg/commit/3e9ed6d1ad6d3531b39c07b8ef3ecf41fce4437f
• https://github.com/borgbackup/borg/commit/4f37fdfed10b50559a0dd333b0d5581c642af329