CVE-2026-121522

Medium

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.

SeverityMedium

CVSS6.7

Exploit probability—

ProductBuildKit

PublishedNov 3, 2026

First seenNov 4, 2026

Weakness typeCWE-476NULL pointer dereference

How to fix

Update

moby BuildKit0.34.2 or later

Vendor advisories

github.com/moby/buildkit/security/advisories/GHSA-2fqp-xg6f-v7gj

Affected products

Product	Affected versions	Fixed in
moby BuildKit	0.26.0 ≤ v < 0.34.2	0.34.2

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