CVE-2026-62268

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CVE-2026-62268

Summary: borg extract might modify out-of-tree files when extracting maliciously crafted archives

Details: 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/releases/tag/1.4.5, https://github.com/borgbackup/borg/releases/tag/2.0.0b22, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62268.json, https://github.com/borgbackup/borg/security/advisories/GHSA-gfp8-w835-v44j, https://nvd.nist.gov/vuln/detail/CVE-2026-62268, 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, https://github.com/borgbackup/borg/commit/d907f2cb57337041c4fa55ca4682895535e5076b