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.
Project Subscriptions
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No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Wed, 23 Sep 2026 17:30:00 +0000
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Wed, 23 Sep 2026 16:30:00 +0000
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ssvc
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Wed, 23 Sep 2026 15:30:00 +0000
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cvssV3_1
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Wed, 23 Sep 2026 11:45:00 +0000
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| Description | 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. | |
| Title | Apache BuildStream: tar source extraction escape | |
| Weaknesses | CWE-59 | |
| References |
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Projects
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-09-23T16:08:58.171Z
Reserved: 2026-08-28T14:59:00.996Z
Link: CVE-2026-82331
Updated: 2026-09-23T14:55:51.225Z
Status : Awaiting Analysis
Published: 2026-09-23T07:16:46.493
Modified: 2026-09-23T17:58:26.570
Link: CVE-2026-82331
No data.
OpenCVE Enrichment
Updated: 2026-09-23T16:45:03Z