Arbitrary file creation via tar symlink escape
Published Sep 15, 2026 · Updated Sep 15, 2026
Path traversal in buildah/copier allows local users to create files outside an extraction directory via crafted tar symlinks. The extraction path handling follows attacker-controlled symbolic links without keeping resulting writes beneath the caller-supplied destination. Exploitation requires a non-root application to invoke the package outside Buildah; Buildah's chroot hardening blocks this path.
Summary
What happened
Path traversal in buildah/copier allows local users to create files outside an extraction directory via crafted tar symlinks. The extraction path handling follows attacker-controlled symbolic links without keeping resulting writes beneath the caller-supplied destination. Exploitation requires a non-root application to invoke the package outside Buildah; Buildah's chroot hardening blocks this path.
The record
- CVE
- CVE-2026-79705
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- Red Hat
- Product
- Red Hat OpenShift Virtualization
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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