CVE-2026-44517: Github.com/containers/buildah Build Breakout Using Malicious Containerfile Vulnerability

MODERATE
Advisory Identifier: GHSA-49p4-px3h-rq49
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CVSS 6.3
CWE-22
Published
Advisory Summary

CVE-2026-44517 is a MODERATE (CVSS 6.3) build breakout using malicious containerfile vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/containers/buildah libraries in the Go ecosystem. The issue involves build breakout using malicious containerfile and git smart http server or github release tar archive. Remediation is available by upgrading affected packages to version 1.43.2.

CVE-2026-44517 at a Glance

CVE Identifier CVE-2026-44517
GHSA Identifier GHSA-49p4-px3h-rq49
Severity MODERATE
CVSS v3.1 Base Score 6.3
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Github.com/containers/buildah
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-44517

To remediate this vulnerability, upgrade all affected Github.com/containers/buildah dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/containers/buildah fixed: 1.43.2 
Upgrade github.com/containers/buildah to 1.43.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/containers/buildah

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-44517, inspect your project dependencies for Github.com/containers/buildah:

inspect dependencies for github.com/containers/buildah

Analyze the terminal output to locate any version of Github.com/containers/buildah in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.43.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Github.com/containers/buildah, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact When processing a build contexts or `add`/`copy` instructions, a malicious server serving a Git repository or a tar archive file can cause files outside of the build context directory to be included in the build context or copied into the build. ### Patches Fixed in Buildah 1.44 and 1.43.2.

CVE-2026-44517 Affected Github.com/containers/buildah Versions

1 component(s)
Fixed Versions:
1.43.2
Product / Package Ecosystem Affected Versions Fixed Version
github.com/containers/buildah
golang/github.com/containers/buildah
Go
≥ 1.38.1
< 1.43.2
1.43.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/containers/buildah/security/advisories/GHSA-49p4-px3h-rq49
GitHub Advisory / Wiki ADVISORY
https://github.com/podman-container-tools/buildah/security/advisories/GHSA-49p4-px3h-rq49
Github.com/containers/buildah Source Repository REPOSITORY
https://github.com/podman-container-tools/buildah

Frequently Asked Questions

What is CVE-2026-44517?
CVE-2026-44517 is a security vulnerability in Github.com/containers/buildah involving Build breakout using malicious Containerfile and Git Smart HTTP server or GitHub release tar archive under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Github.com/containers/buildah versions are affected?
Affected versions include releases prior to 1.43.2 across affected packages: github.com/containers/buildah.
What version fixes CVE-2026-44517?
Upgrading to 1.43.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/containers/buildah affected?
Yes, github.com/containers/buildah is affected in releases prior to 1.43.2. Upgrade your dependency to 1.43.2 or later.
What is the CVSS score of CVE-2026-44517?
CVE-2026-44517 has a CVSS v3.1 base score of 6.3 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-44517?
CVE-2026-44517 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check Go dependencies for CVE-2026-44517?
Run the dependency tree command: 'inspect dependencies for github.com/containers/buildah'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-49p4-px3h-rq49",
  "modified" : "2026-06-22T20:15:48Z",
  "published" : "2026-06-22T20:15:48Z",
  "aliases" : [ "CVE-2026-44517" ],
  "summary" : "Build breakout using malicious Containerfile and Git Smart HTTP server or GitHub release tar archive",
  "details" : "### Impact\n\nWhen processing a build contexts or `add`/`copy` instructions, a malicious server serving a Git repository or a tar archive file can cause files outside of the build context directory to be included in the build context or copied into the build.\n\n### Patches\n\nFixed in Buildah 1.44 and 1.43.2.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/containers/buildah"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.38.1"
      }, {
        "fixed" : "1.43.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/containers/buildah/security/advisories/GHSA-49p4-px3h-rq49"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/podman-container-tools/buildah/security/advisories/GHSA-49p4-px3h-rq49"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/podman-container-tools/buildah"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-22T20:15:48Z",
    "nvd_published_at" : null
  }
}