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CVE-2026-18508VulnerabilityPublished Updated

GNU tar · Link Following

Source GCVE Database

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Authoritative record:CVE-2026-18508· Medium 4.4

Not known to be exploited · CVSS 4.4 Medium : update Red Hat Enterprise Linux 10 when convenient.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 3.1 base score
4.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.14.4
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10tarAffected–Fixed in–
Red Hat Enterprise Linux 8tarAffected–Fixed in–
Red Hat Enterprise Linux 9tarAffected–Fixed in–
Red Hat Discovery 2discovery/discovery-server-rhel9Affected–Fixed in–
Red Hat Hardened Imagestar-mainAffected–Fixed in–
Red Hat Update Infrastructure 5rhui5/cds-kubernetes-rhel9Affected–Fixed in–

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.

References

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