Bug 2521191 (CVE-2026-44517)

Summary: CVE-2026-44517 github.com/containers/buildah: Buildah: Build breakout via malicious Git repository or tar archive
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aruklets, dfreiber, doconnor, drow, eglynn, jburrell, jjoyce, jpretori, jschluet, lhh, mburns, mgarciac, rhel-process-autobot, sdawley, vkumar, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Buildah. Insecure handling of temporary directories and symlinks during the image build process, specifically within `TempDirForURL`, `downloadToDirectory`, and `stdinToDirectory` functions, allows a malicious server supplying a Git repository or tar archive to cause files outside the build context directory to be included or copied into the build. This could lead to a build breakout, enabling an attacker to manipulate files on the host system.
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Description OSIDB Bzimport 2026-08-21 20:48:33 UTC 
Buildah is a tool that facilitates building OCI images. From 1.38.1 until 1.43.2 and 1.44.0, TempDirForURL in define/types.go does not securely confine Git repository subdirectories to the downloaded build context, and downloadToDirectory and stdinToDirectory can follow a Dockerfile symlink left by a partially extracted tar archive. A malicious server supplying a Git repository or tar archive can cause files outside the build context directory to be included in the context or copied into the build. This issue is fixed in versions 1.43.2 and 1.44.0.