GNU tar · Link Following
Source GCVE Database
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
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 4.4 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
Patches and advisories
- access.redhat.com/errata/RHSA-2026:50807 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61581 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61586 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61783 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:66018 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:70390 (opens in a new tab)
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10tar | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8tar | Affected– | Fixed in– |
| Red Hat Enterprise Linux 9tar | Affected– | Fixed in– |
| Red Hat Discovery 2discovery/discovery-server-rhel9 | Affected– | Fixed in– |
| Red Hat Hardened Imagestar-main | Affected– | Fixed in– |
| Red Hat Update Infrastructure 5rhui5/cds-kubernetes-rhel9 | Affected– | 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
- nvd.nist.gov/vuln/detail/CVE-2026-18508 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:50807 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61581 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61586 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61783 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:66018 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:70390 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-18508 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2509843 (opens in a new tab)