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4.4Medium

CVE-2026-18477Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape

Red Hat Red Hat Enterprise Linux 10; Red Hat Red Hat Enterprise Linux 8; Red Hat Red Hat Enterprise Linux 9; Red Hat Red Hat Discovery 2 Published: (3 months ago)

Description

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Weakness (CWE): CWE-367

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
discovery 2 —
enterprise linux 8 —
enterprise linux 9 —
gnu tar 1.35
redhat enterprise linux 8.0
redhat openshift container platform 4.0
Red Hat Red Hat Discovery 2 all versions
Red Hat Red Hat Enterprise Linux 10 all versions
Red Hat Red Hat Enterprise Linux 6 —
Red Hat Red Hat Enterprise Linux 7 —
Red Hat Red Hat Enterprise Linux 8 all versions
Red Hat Red Hat Enterprise Linux 9 all versions
Red Hat Red Hat Hardened Images all versions
Red Hat Red Hat OpenShift Container Platform 4 all versions
Red Hat Red Hat OpenShift Container Platform 5 all versions
Red Hat Red Hat Update Infrastructure 5 all versions
rhui 5 —

References and patches

CPE matches (NVD) (5)
  • cpe:2.3:a:gnu:tar:1.35:*:*:*:*:*:*:*
  • cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

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