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CVE-2026-18477VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-18477· Medium 4.4

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

Data as of 5 Nov 2026, 23:24 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
0.08% chance of exploitation in 30 days – higher than 0% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.35
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/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 5 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–

AI-suggested

Red Hat has released an official security update fixing this vulnerability in tar version 1.35-9.1.hum1. Users of Red Hat Hardened Images should apply this update promptly to mitigate the issue. No additional mitigation steps are indicated by the vendor advisory.

Description

A medium severity vulnerability (CVE-2026-18477) affecting the tar utility in Red Hat Hardened Images and SUSE Linux Enterprise has been addressed by Red Hat. The issue is classified under CWE-367 and fixed in tar version 1.35-9.1.hum1 for relevant architectures including aarch64 and x86_64. No known exploits are reported in the wild. The update is available as part of Red Hat Hardened Images RPMs security update RHSA-2026:49361.

References

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