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Fencer Vulns
medium 4.5

CVE-2026-79705 json

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

published 2026-09-15 54 d ago modified 2026-11-06 3 d ago also EUVD-2026-78823

cvss
4.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Hardened Images 6.1.3-1.hum1
  • podman hummingbird 1 6.1.3-1.hum1
  • podmansh hummingbird 1 6.1.3-1.hum1
  • podman-docker hummingbird 1 6.1.3-1.hum1
  • podman-remote hummingbird 1 6.1.3-1.hum1
  • podman-machine hummingbird 1 6.1.3-1.hum1

red hat advisories RHSA-2026:74861

  • podman Alpine 3.24 5.8.8-r0

alpine advisories ALPINE-CVE-2026-79705

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-79705 updated cvss 4.5

podman: buildah: buildah/copier: Directory escape via crafted tar symlinks when used outside Buildah by non-root callers

  • Red Hat Ansible Automation Platform 2 python-podman, python3x-podman, python3.11-podman, python3.12-podman, ansible-automation-platform-24/eda-controller-rhel8, ansible-automation-platform-25/eda-controller-rhel8, +2 more Red Hat Enterprise Linux 8 podman, buildah, ubi8/podman, podman-tests, ubi8/buildah, buildah-tests, +6 more Red Hat Enterprise Linux 9 podman, buildah, ubi9/podman, podman-tests, ubi9/buildah, buildah-tests, +6 more Red Hat Enterprise Linux 10 podman, buildah, ubi10/podman, python-podman, ubi10/buildah, rhel10/buildah Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +4 more Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    +3 more products
    Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10 Red Hat OpenShift Virtualization 4 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images podman 6.1.3-1.hum1, podmansh 6.1.3-1.hum1, podman-docker 6.1.3-1.hum1, podman-remote 6.1.3-1.hum1, podman-machine 6.1.3-1.hum1
    fixed: vendor fix RHSA-2026:74861
  • Red Hat Hardened Images buildah
    not affected: inline mitigations already exist

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
54 d ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5
  • Red Hat Red Hat OpenShift Dev Spaces
  • Red Hat Red Hat OpenShift Virtualization 4
  • Red Hat Red Hat Quay 3

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.