In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon. The issue is fixed in v0.34.2.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00118.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
moby BuildKit unaffected
Version Status Constraints
0.26.0 affected < 0.34.2

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

Upgrade BuildKit to v0.34.2 or later.

Workaround

Avoid untrusted build definitions. Only specific builds using Git dependencies trigger this issue.

References
Link Providers
https://github.com/moby/buildkit/security/advisories/GHSA-2fqp-xg6f-v7gj cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-121522 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-121522 cve-icon
History

Thu, 05 Nov 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-248
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 04 Nov 2026 01:15:00 +0000

Type Values Removed Values Added
First Time appeared Moby
Moby buildkit
Vendors & Products Moby
Moby buildkit

Tue, 03 Nov 2026 22:15:00 +0000

Type Values Removed Values Added
Description In BuildKit versions v0.26.0 through v0.34.1, a specific build definition that resolves metadata for the same Git source reference twice can cause the BuildKit daemon to panic and crash, interrupting builds handled by that daemon. The issue is fixed in v0.34.2.
Title Possible panic from Git source resolver
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 6.7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Docker

Published:

Updated: 2026-11-03T22:09:29.028Z

Reserved: 2026-11-03T14:27:34.585Z

Link: CVE-2026-121522

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-03T22:19:46.003

Modified: 2026-11-03T22:19:46.003

Link: CVE-2026-121522

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-11-03T22:09:29Z

Links: CVE-2026-121522 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T01:45:14Z

Weaknesses