CVE-2026-18508 - Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

CVE-2026-18508 - Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite

https://cvefeed.io/rssfeed/latest.atom / Mon, 08/03/2026 - 19:09
CVE ID :CVE-2026-18508
Published : Aug. 3, 2026, 4:16 p.m. | 37 minutes ago
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.
Severity: 4.4 | MEDIUM
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.