CVE record · CVE-2026-18477

Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape

CVSS 4.4 MediumEPSS 0.0008 · 1st percentile

Published by the CVE Program (CNA: redhat) at 3 Aug 2026, 15:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10 Package name: tar https://access.redhat.com/downloads/content/package-browser/	unaffected 2:1.35-13.el10_2 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: tar https://access.redhat.com/downloads/content/package-browser/	unaffected 2:1.30-13.el8_10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: tar https://access.redhat.com/downloads/content/package-browser/	unaffected 2:1.34-13.el9_8 to before * rpm Other versions: affected
Red Hat	Red Hat Discovery 2 Package name: discovery/discovery-server-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788205779 to before * rpm Other versions: affected
Red Hat	Red Hat Hardened Images Package name: tar-main https://catalog.redhat.com/software/containers/	unaffected 1.35-9.1.hum1 to before * rpm Other versions: affected
Red Hat	Red Hat Update Infrastructure 5 Package name: rhui5/cds-kubernetes-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788880445 to before * rpm Other versions: affected
Red Hat	Red Hat Update Infrastructure 5 Package name: rhui5/cds-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788880464 to before * rpm Other versions: affected
Red Hat	Red Hat Update Infrastructure 5 Package name: rhui5/haproxy-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788880456 to before * rpm Other versions: affected
Red Hat	Red Hat Update Infrastructure 5 Package name: rhui5/installer-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788765051 to before * rpm Other versions: affected
Red Hat	Red Hat Update Infrastructure 5 Package name: rhui5/rhua-rhel9 https://catalog.redhat.com/software/containers/	unaffected 1788880581 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 6 Package name: tar https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unknown
Red Hat	Red Hat Enterprise Linux 7 Package name: tar https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unknown
Red Hat	Red Hat Hardened Images Package name: aardvark-dns https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: chunkah https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: grafana12.4 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: grafana13.1 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: netavark https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: nodejs26 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: python-cryptography https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: rust https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: rust-rpm-sequoia https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat Hardened Images Package name: yarnpkg https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unaffected
Red Hat	Red Hat OpenShift Container Platform 4 Package name: openshift/ose-rhel-coreos-8 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 4 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected
Red Hat	Red Hat OpenShift Container Platform 5 Package name: openshift/ose-rhel-coreos-9 https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected

Identifiers: CVE-2026-18477
CNA: redhat
Weakness (CWE): CWE-367
Tags: Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Discovery 2
Red Hat Hardened Images
Red Hat Update Infrastructure 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Race condition
Published: 3 Aug 2026
Updated: 5 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.4	Medium	3.1	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N	CNA (redhat)

CISA KEV Not listed.
EPSS 0.0008, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Aug 2026, 15:34 UTC Confirmed by the CVE List
3 Aug 2026, 17:16 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:49361 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:61581 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:61586 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:61783 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:66018 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:70390 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2026-18477 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2509735 issue-trackingredhat

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.