Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-82331

Severity CVSS v4.0:
Pending analysis
Type:
CWE-59 Link Following
Publication date:
23/09/2026
Last modified:
23/09/2026

Description

Improper link resolution before file access (&amp;#39;link following&amp;#39;) vulnerability in the `tar` source plugin of Apache BuildStream running on Python = 3.12, BuildStream &gt;= 2.3.0 already makes use of the Python `tarfile` filter functionality, which blocks the symlink escape<br /> <br /> Users are recommended to upgrade to version 2.8.1, which fixes this issue.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

References to Advisories, Solutions, and Tools