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4.4 Medium

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

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.

CVSS 3.1 detail

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

Exploitable with local access to the machine, without an account and if a user takes an action; the impact on data or service is limited.

Attack vector
Local
Attack complexity
Low
Privileges required
None
Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Hardened Images Versions not published
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat Discovery 2 1788205779 earliest → < 1788205779 1788205779
Red Hat Update Infrastructure 5 1788880581 earliest → < 1788880581 1788880581
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Product Affected versions Fixed in
Red Hat OpenShift Container Platform 5 Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of Red Hat Enterprise Linux 10

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CVE-2026-123151 Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail Not rated CVE-2026-121997 Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mismatch 8.1 High CVE-2026-121996 Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted agent-expression length 8.2 High CVE-2026-121995 Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail 7.5 High
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