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CVE-2026-93323— Oversized Dockerfile or .dockerignore can exhaust buildkitd memory

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.

Dockerfile 前端在加载构建上下文中的 Dockerfile 和 .dockerignore 文件到内存时，未设置大小限制。如果构建上下文中包含超大文件，可能导致 buildkitd 分配与该文件成比例的内存，从而耗尽内存并终止守护进程，进而中断在同一实例上运行的其他构建操作。该问题已通过拒绝加载超过 16 MiB 的文件来修复。

CVSS 6.8 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby BuildKit ≤ 0.33.0 affected
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I. Basic Information for CVE-2026-93323

Vulnerability Information
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Vulnerability Title
Oversized Dockerfile or .dockerignore can exhaust buildkitd memory
Source: CVE Program / CVE List V5
Vulnerability Description
The Dockerfile frontend loaded the Dockerfile and .dockerignore files of a build context into memory without a size limit. A build context containing an oversized file could make buildkitd allocate memory proportional to that file, potentially exhausting memory and terminating the daemon, which interrupts other builds on the same instance. Fixed by rejecting such files above 16 MiB.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
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-2026-93323

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III. Intelligence Information for CVE-2026-93323

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Vendor Pages for CVE-2026-93323 (1)

Other References for CVE-2026-93323 (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-2026-93320 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-2026-93319 5.7 MEDIUM A malicious frontend can cause a daemon panic

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-789

V. Comments for CVE-2026-93323

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