What is CVE-2026-18477?

CVE-2026-18477 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.4/10. Published 2026-08-03.

How severe is CVE-2026-18477?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-18477

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…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N.

Affected products

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18477?: CVE-2026-18477 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.4/10. Published 2026-08-03.
How severe is CVE-2026-18477?: Medium severity. CVSS v3 base score is 4.4 out of 10.