CVE-2026-33748: BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable

Q: How do I fix CVE-2026-33748?

buildkit: upgrade to 0.28.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-33748 being exploited?

CVE-2026-33748 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33748 affect?

CVE-2026-33748 affects buildkit. Severity is high (CVSS 7.5). BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside

Q: How urgent is CVE-2026-33748?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-33748 is a high-severity flaw (CVSS 7.5) affecting buildkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpat

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-22, CWE-59
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: mobyproject

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 15:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

mobyproject buildkit UPGRADE

Affected: < 0.28.1

Fixed in: 0.28.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy buildkit || rpm -q buildkit || buildkit --version

2. UPGRADE to 0.28.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade buildkit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade buildkit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33748?

buildkit: upgrade to 0.28.1. Exact commands for each OS are on this page.

Is CVE-2026-33748 being exploited?

CVE-2026-33748 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33748 affect?

CVE-2026-33748 affects buildkit. Severity is high (CVSS 7.5). BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside

How urgent is CVE-2026-33748?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Git vulnerabilities

Related CVEs

CVE-2026-15788 HIGH 7.5 UPGRADE BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS di
CVE-2026-15789 HIGH 7.5 UPGRADE A custom client can produce such an upload request to the BuildKit daemon that files can escape from the Build
CVE-2026-15791 HIGH 7.5 UPGRADE A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory
CVE-2026-15792 HIGH 7.5 UPGRADE A malicious BuildKit client or frontend could craft a request that could lead to BuildKit daemon crashing with
CVE-2026-15793 HIGH 7.5 UPGRADE BuildKit custom frontends or clients using the raw low-level API can set git.checkoutbundle=true when checking

References

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