CVE-2026-82331

9.8 CRITICAL

Published 2026-09-23 · Updated 2026-09-23

AI risk analysis

Summary: This flaw allows malicious source tarballs to write files on the host, posing a critical risk due to potential privilege escalation.
Exploitability: Exploitation is moderately hard as it requires a malicious source tarball and the use of symlinks, but is feasible under certain conditions.
Blast radius: If exploited, the impact is severe, as it can lead to unauthorized file writes and potential privilege escalation on the host system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to BuildStream version 2.8.1 or later.

rcefile-writepriv-escalationpythonbuildstream

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-59

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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