CVE-2026-18508

Low

No strong exploitation signal.

CVSS base

4.4 MEDIUM

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

EPSS — probability of exploitation (30 days)

0.1%

3.8th percentile

CISA KEV

Not listed

Weakness / dates

CWE-59

Published 2026-08-03 · modified 2026-09-10

CVSS breakdown

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

Attack Vector	L	Local
Attack Complexity	L	Low
Privileges Required	N	None
User Interaction	R	Required
Scope	U	Unchanged
Confidentiality	L	Low
Integrity	L	Low
Availability	N	None

Timeline

2026-08-03 — Published (NVD)
2026-09-10 — Last modified (NVD)

Description

A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.

Affected

gnu redhat

References

Official: NVD · CVE.org