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CVE-2026-93321— Malformed LLB file operation can crash buildkitd

Quick assessment

Affected
moby BuildKit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

恶意的前端可以提交一个LLB定义，导致buildkitd发生 panic 并终止，从而中断在该守护进程上运行的所有构建任务。

CVSS 6.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-93321

Vulnerability Information
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Vulnerability Title
Malformed LLB file operation can crash buildkitd
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious frontend can submit an LLB definition that causes buildkitd to panic and terminate, interrupting all builds running on that daemon.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moby BuildKit 0 ~ 0.33.0 -

II. Public POCs for CVE-2026-93321

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III. Intelligence Information for CVE-2026-93321

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Vendor Pages for CVE-2026-93321 (1)

Other References for CVE-2026-93321 (1)

Same Patch Batch · moby · 2026-10-05 · 10 CVEs total

CVE-2026-93318 7.5 HIGH Cache poisoning via unvalidated image layer DiffIDs
CVE-2026-93316 7.1 HIGH Starting daemon with --cdi-disabled flag can lead to panic on specific builds
CVE-2026-93322 6.9 MEDIUM Malformed MergeOp can crash the BuildKit daemon
CVE-2026-93323 6.8 MEDIUM Oversized Dockerfile or .dockerignore can exhaust buildkitd memory
CVE-2026-93320 6.0 MEDIUM BuildKit improperly handles special files in build snapshots
CVE-2026-93326 6.0 MEDIUM Crafted Git build source can bypass certain policy validation
CVE-2026-93317 5.9 MEDIUM Container blob cache can accept unverified content
CVE-2026-93315 5.8 MEDIUM BuildKit proxy CA cleanup can be disrupted by build steps
CVE-2026-93319 5.7 MEDIUM A malicious frontend can cause a daemon panic

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-129

V. Comments for CVE-2026-93321

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