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

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2026-11940

Severity CVSS v4.0:
HIGH
Type:
CWE-22 Path Traversal
Publication date:
23/06/2026
Last modified:
23/07/2026

Description

tarfile.extractall() with the &amp;#39;data&amp;#39; or &amp;#39;tar&amp;#39;<br /> filter could be bypassed by a crafted archive where a hardlink <br /> references a symlink stored at a deeper name than the hardlink itself.  <br /> The extraction fallback validated the symlink at it&amp;#39;s archived location <br /> but recreated it at the hardlink&amp;#39;s shallower<br /> path, letting a relative<br /> target the filter judged contained escape the destination directory.  <br /> This allowed a malicious tar archive to create a symlink pointing <br /> outside the destination, enabling out-of-destination file reads or <br /> writes. This was an incomplete fix of CVE-2025-4330.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): None
Confidentiality (SC): High
Integrity (SI): High
Availability (SA): None

Base Score 4.0
7.80
Severity 4.0
HIGH

References to Advisories, Solutions, and Tools