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fkie_cve-2026-62268

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.

GHSA-gfp8-w835-v44j — borg extract might modify out-of-tree files when extracting maliciously crafted archives

Affected: PyPI: borgbackup

### Impact

A maliciously crafted archive could contain a symlink (e.g. "evil" -> "/etc") followed by an item below it ("evil/passwd"), or an item whose path embeds ".." (e.g. "a/../../etc/passwd").

When extracting such items, borg followed the symlink / resolved the "..", so it could delete or overwrite files outside the extraction directory.

In a quite similar scenario, a crafted archive could contain a slave hardlink item with the hardlink source pointing outside the extraction directory.

When extracting such an item, borg would hard-link the outside and the inside item. Note: that sounds bad, but it is no big issue in practice: to create such a malicious archive, the attacker would need repository access and (for encrypted or authenticated repos) also the borg key and passphrase.

Affected: likely all borg releases before 1.4.5 (and also all borg 2.0.0 betas before b22).

### Patches - 1.4.x release series: fix released with 1.4.5. commits 3e9ed6d1ad6d3531b39c07b8ef3ecf41fce4437f and 141888f2fabcd57a300547c2aa63212cb213924d. - 1.2.x release series: no new releases any more, fix commits available on 1.2-maint branch: 0ac568e290518c3bbe781459978720dde7fab224 and d907f2cb57337041c4fa55ca4682895535e5076b - 2.0.0 betas: fix will be in 2.0.0b22, fix commits on master branch: 2d632531028b09da8ab5d1450f89bebcc205d640 and 4f37fdfed10b50559a0dd333b0d5581c642af329

### Workarounds For encrypted or authenticated repositories, do not share borg key and passphrase with potenti…

UBUNTU-CVE-2026-62268

Affected: Ubuntu:16.04:LTS: borgbackup, Ubuntu:18.04:LTS: borgbackup, Ubuntu:20.04:LTS: borgbackup, Ubuntu:22.04:LTS: borgbackup, Ubuntu:24.04:LTS: borgbackup, Ubuntu:24.04:LTS: borgbackup2, Ubuntu:26.10: borgbackup, Ubuntu:26.10: borgbackup2, Ubuntu:26.04:LTS: borgbackup, Ubuntu:26.04:LTS: borgbackup2

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