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    2 vulnerabilities by borgbackup

    CVE-2026-62268 (GCVE-0-2026-62268)

    Vulnerability from cvelistv5 – Published: 2026-11-05 20:28 – Updated: 2026-11-09 22:53
    VLAI
    Title
    borg extract might modify out-of-tree files when extracting maliciously crafted archives
    Summary
    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.
    Severity
    5.3 (Medium)
    CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-09 22:53 UTC
    CWE
    • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
    Assigner
    GitHub_M CNA
    References
    Impacted products
    Vendor Product Version
    borgbackup borg Affected: < 1.4.5
    Affected: >= 2.0.0b1, < 2.0.0b22
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-36811 (GCVE-0-2023-36811)

    Vulnerability from cvelistv5 – Published: 2023-08-30 17:32 – Updated: 2025-02-13 16:56
    VLAI
    Title
    Archive spoofing vulnerability in borgbackup
    Summary
    borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup data loss in the repository. The attack requires an attacker to be able to: 1. insert files (with no additional headers) into backups and 2. gain write access to the repository. This vulnerability does not disclose plaintext to the attacker, nor does it affect the authenticity of existing archives. Creating plausible fake archives may be feasible for empty or small archives, but is unlikely for large archives. The issue has been fixed in borgbackup 1.2.5. Users are advised to upgrade. Additionally to installing the fixed code, users must follow the upgrade procedure as documented in the change log. Data loss after being attacked can be avoided by reviewing the archives (timestamp and contents valid and as expected) after any "borg check --repair" and before "borg prune". There are no known workarounds for this vulnerability.
    Severity
    4.7 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2024-10-01 14:49 UTC
    CWE
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    GitHub_M CNA
    References
    Impacted products
    Vendor Product Version
    borgbackup borg Affected: < 1.2.5
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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