CVE-2026-33748Network attack vector

File disclosure via symlinked Git subdir escape

Published Mar 27, 2026 · Updated Mar 27, 2026

Path traversal in Moby BuildKit before 0.28.1 allows remote attackers to read files outside a Git repository via a crafted subdir fragment. Git URL fragment subdir handling fails to confine symlink resolution to the checked-out repository root, allowing traversal into the mounted filesystem. Exploitation requires a build using a Git URL with a subpath that points through a symlink, and disclosure is limited to files on the same mounted filesystem.

CVSS severity8.2
High
EPSS probability0.46%
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 Moby BuildKit before 0.28.1 allows remote attackers to read files outside a Git repository via a crafted subdir fragment. Git URL fragment subdir handling fails to confine symlink resolution to the checked-out repository root, allowing traversal into the mounted filesystem. Exploitation requires a build using a Git URL with a subpath that points through a symlink, and disclosure is limited to files on the same mounted filesystem.

The record

CVE
CVE-2026-33748
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Moby Project
Product
BuildKit
Classifications
CWE-22, CWE-59, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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=< 0.28.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moby Project · BuildKitversion=< 0.28.1

Published CVSS scores

8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59Improper Link Resolution Before File Access ('Link Following')
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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