Path Traversal in buildah/copier Go package (CVE-2026-79705)
Summary
Path traversal in buildah/copier Go package (CVE-2026-79705). Data can be tampered with by attackers.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-79705 has been found in buildah/copier Go package.
Data can be tampered with by attackers. CVSS score: 4.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "buildah/copier Go package CVE-2026-79705" on the vendor's site.
CVE-2026-79705 (buildah/copier Go package) — CWE-22 / CVSS v3 4.5
Attack vector: remote (network-reachable)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in buildah/copier Go package.
Check the vendor advisory for the affected versions of buildah/copier Go package.
Severity: Medium (CVSS 4.5/10). Data can be tampered with by attackers.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで buildah/copier Go package を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web access.redhat.com
- web access.redhat.com
- web bugzilla.redhat.com
- web nvd.nist.gov
- web github.com