Symlink Attack Affecting buildstream package, versions [,2.8.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-BUILDSTREAM-20260800
- published29 Sept 2026
- disclosed23 Sept 2026
- creditUnknown
Introduced: 23 Sep 2026
NewCVE-2026-82331 (opens in a new tab)How to fix?
Upgrade BuildStream to version 2.8.1 or higher.
Overview
BuildStream is an A framework for modelling build pipelines in YAML
Affected versions of this package are vulnerable to Symlink Attack in the tar source plugin when handling archive extraction. An attacker can modify or overwrite arbitrary files on the host system by supplying a malicious tarball containing symlinks during the source fetching process. This is only exploitable if the environment is running on Python versions earlier than 3.12 and the user explicitly fetches an untrusted archive.