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CVE-2026-93320— BuildKit improperly handles special files in build snapshots

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.

BuildKit 可能会被诱骗，在处理特殊文件 inode 时执行文件操作，而正常情况下应针对普通文件进行这些操作。特殊文件可能导致操作阻塞；在具有 root 权限的工作器（rootful workers）中，还可能引发对主机设备的未预期访问。

CVSS 6.0 · Medium

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby BuildKit ≤ 0.33.0 affected
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I. Basic Information for CVE-2026-93320

Vulnerability Information
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Vulnerability Title
BuildKit improperly handles special files in build snapshots
Source: CVE Program / CVE List V5
Vulnerability Description
BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
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-2026-93320

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III. Intelligence Information for CVE-2026-93320

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Vendor Advisories for CVE-2026-93320 (1)

Vendor Pages for CVE-2026-93320 (1)

Same Patch Batch · moby · 2026-10-05 · 8 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-2026-93326 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-2026-93319 5.7 MEDIUM A malicious frontend can cause a daemon panic

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-441

V. Comments for CVE-2026-93320

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