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    2 vulnerabilities found for Apache BuildStream by Apache Software Foundation

    CVE-2026-82331 (GCVE-0-2026-82331)

    Vulnerability from nvd – Published: 2026-09-23 06:58 – Updated: 2026-09-23 16:08
    VLAI
    Title
    Apache BuildStream: tar source extraction escape
    Summary
    Improper link resolution before file access ('link following') vulnerability in the `tar` source plugin of Apache BuildStream running on Python < 3.12 allows malicious source tarballs to write files on the host, with the privileges of the user running BuildStream, via symlinks as part of source fetching. The impact of this issue is mitigated by: * BuildStream projects should only use trusted sources in their elements as otherwise the build output can also not be trusted * Tracking a source tarball pins its SHA256 hash, which prevents MITM attacks of users that are fetching an already tracked project * When running on Python >= 3.12, BuildStream >= 2.3.0 already makes use of the Python `tarfile` filter functionality, which blocks the symlink escape Users are recommended to upgrade to version 2.8.1, which fixes this issue.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-23 14:55 UTC
    CWE
    • CWE-59 - Improper link resolution before file access ('link following')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Apache Software Foundation Apache BuildStream Affected: 0 , ≤ 2.8.0 (semver)
    Unaffected: 2.8.1 (semver)
    		Create a notification for this product.
    Credits
    Gjoko Krstic of Zero Science Lab
    Show details on NVD website
    To clipboard 

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    CVE-2026-82331 (GCVE-0-2026-82331)

    Vulnerability from cvelistv5 – Published: 2026-09-23 06:58 – Updated: 2026-09-23 16:08
    VLAI
    Title
    Apache BuildStream: tar source extraction escape
    Summary
    Improper link resolution before file access ('link following') vulnerability in the `tar` source plugin of Apache BuildStream running on Python < 3.12 allows malicious source tarballs to write files on the host, with the privileges of the user running BuildStream, via symlinks as part of source fetching. The impact of this issue is mitigated by: * BuildStream projects should only use trusted sources in their elements as otherwise the build output can also not be trusted * Tracking a source tarball pins its SHA256 hash, which prevents MITM attacks of users that are fetching an already tracked project * When running on Python >= 3.12, BuildStream >= 2.3.0 already makes use of the Python `tarfile` filter functionality, which blocks the symlink escape Users are recommended to upgrade to version 2.8.1, which fixes this issue.
    Severity
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-23 14:55 UTC
    CWE
    • CWE-59 - Improper link resolution before file access ('link following')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Apache Software Foundation Apache BuildStream Affected: 0 , ≤ 2.8.0 (semver)
    Unaffected: 2.8.1 (semver)
    		Create a notification for this product.
    Credits
    Gjoko Krstic of Zero Science Lab
    Show details on NVD website
    To clipboard 

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