Is there a public exploit for CVE-2026-18508?

No public exploit for CVE-2026-18508 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-18508?

CVE-2026-18508 scores CVSS 4.4 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.14%.

What does CVE-2026-18508 affect?

CVE-2026-18508 affects Red Hat Red Hat Update Infrastructure 5, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Discovery 2, Red Hat Hardened Images.

4.4 Medium

A flaw was found in GNU tar.

CVE-2026-18508

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.

Assessment

CVSS: 4.4 (v3.1)
Severity: Medium
EPSS: 0.14% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 August 2026
Last updated: 2 November 2026
Affected: Red Hat · Red Hat Discovery 2 · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9
Assigner: redhat

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

At the source

EUVD (ENISA)

References

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