CVE-2026-44517

Host-file disclosure via build-context path escape

Published Aug 21, 2026 · Updated Aug 25, 2026

Path traversal in Containers Buildah 1.38.1 through 1.43.1 allows attackers to copy host files into image builds via crafted contexts. TempDirForURL joins an untrusted Git subdirectory without secure confinement, while downloadToDirectory and stdinToDirectory follow a Dockerfile symlink left by partial tar extraction. Exploitation requires a user to build from a malicious Git repository or tar archive and exposes host files to the resulting build context or image.

CVSS severity6.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Containers Buildah 1.38.1 through 1.43.1 allows attackers to copy host files into image builds via crafted contexts. TempDirForURL joins an untrusted Git subdirectory without secure confinement, while downloadToDirectory and stdinToDirectory follow a Dockerfile symlink left by partial tar extraction. Exploitation requires a user to build from a malicious Git repository or tar archive and exposes host files to the resulting build context or image.

The record

CVE
CVE-2026-44517
Published
Aug 21, 2026
Updated
Aug 25, 2026
Vendor
Containers
Product
Buildah
Classifications
CWE-22, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.38.1, < 1.43.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Containers · Buildahversion=>= 1.38.1, < 1.43.2

Published CVSS scores

6.3GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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