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CVE-2026-93317— Container blob cache can accept unverified content

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.

一个未经身份验证的攻击者，如果控制了注册表或 OCI 布局的 blob 源，可以提供与所声称的摘要（digest）不匹配的 blob 内容。由此生成的快照可能会以该摘要作为标识被缓存，并在后续被其他受害者构建任务所重用，从而导致构建输入完整性遭到破坏。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby BuildKit 0.28.0< 0.33.1 affected
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I. Basic Information for CVE-2026-93317

Vulnerability Information
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Vulnerability Title
Container blob cache can accept unverified content
Source: CVE Program / CVE List V5
Vulnerability Description
An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moby BuildKit 0.28.0 ~ 0.33.1 -

II. Public POCs for CVE-2026-93317

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-93317

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Vendor Advisories for CVE-2026-93317 (1)

Vendor Pages for CVE-2026-93317 (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-2026-93320 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-2026-93319 5.7 MEDIUM A malicious frontend can cause a daemon panic

IV. Related Vulnerabilities

Same product: BuildKit
Same vendor: moby
Same weakness: CWE-354

V. Comments for CVE-2026-93317

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