EUVD-2026-62837
GHSA-72x6-4j93-7w86
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker publishes a crafted image requiring no target privileges (PR:N); a developer must pull and build it (UI:R); sole impact is restartable buildkitd crash (A:L).
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
3DescriptionCVE.org
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.1, BuildKit read attacker-controlled /etc/passwd and /etc/group files without an upper bound while resolving a username to a user identifier or group identifier in executor/oci/user.go and solver/llbsolver/ops/user_linux.go. A malicious base image or build could provide oversized files that exhausted memory during user resolution and caused out-of-memory termination of the buildkitd process. This issue is fixed in version 0.31.1.
AnalysisAI
Memory exhaustion in BuildKit prior to v0.31.1 allows a denial-of-service condition against the buildkitd daemon when it processes a maliciously crafted base image. The daemon reads /etc/passwd and /etc/group from attacker-controlled images without any size limit during UID/GID resolution, enabling an oversized file to exhaust host memory and trigger an OOM kill of buildkitd. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following: (1) the build uses an attacker-controlled base image containing an oversized /etc/passwd or /etc/group file; (2) the Dockerfile or build definition includes a USER instruction or a chown operation that triggers UID/GID resolution, causing BuildKit to parse the file; and (3) the buildkitd process is running a version <= 0.31.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 2.3 (Low) is an accurate reflection of real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade BuildKit to v0.31.1 or later, available at https://github.com/moby/buildkit/releases/tag/v0.31.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Denial Of Service
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External POC / Exploit Code
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