Podman: buildah: buildah/copier: directory escape via crafted tar symlinks when used outside buildah by non-root callers

Description

A flaw was found in the buildah/copier Go package. When used outside of Buildah by a non-root caller, a crafted tar archive containing malicious symlinks can escape the target extraction directory and create files outside the intended destination. Buildah itself uses chroot hardening and is not affected.

Timeline

Scores

EPSS (exploitation in 30 days)

0.41% · top 64% of all CVEs (11 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.5.

Affected products

• Red Hat · Red Hat Hardened Images

  • unaffected 6.1.3-1.hum1 – < *

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Ansible Automation Platform 2

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Hardened Images

  All versions: unaffected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: affected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: affected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: affected

• Red Hat · Red Hat OpenShift Container Platform 5

  All versions: affected

• Red Hat · Red Hat OpenShift Dev Spaces

  All versions: affected

• Red Hat · Red Hat OpenShift Dev Spaces

  All versions: affected

• Red Hat · Red Hat OpenShift Dev Spaces

  All versions: affected

• Red Hat · Red Hat OpenShift Virtualization 4

  All versions: affected

• Red Hat · Red Hat Quay 3

  All versions: affected

• Red Hat · Red Hat Quay 3

  All versions: affected

What to do

Workaround: To mitigate this issue, users should ensure that `podman cp` operations are only performed against trusted Podman system service servers. Copying content from untrusted sources may expose the client to directory traversal vulnerabilities.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-78823 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-79705](https://cveledger.app/badge/CVE-2026-79705.svg)](https://cveledger.app/cve/CVE-2026-79705)

Record last updated 6 Nov 2026, 00:55 UTC.