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CVE-2026-61712— BuildKit: Possible runtime DoS via unbounded group parsing

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.

Moby BuildKit是Moby团队开源的一款容器镜像构建引擎。 Moby BuildKit 0.31.1之前版本存在资源管理错误漏洞，该漏洞可导致buildkitd进程因内存不足而终止。

CVSS 2.3 · Low EPSS 0.40% · P34

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby buildkit < 0.31.1 affected
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I. Basic Information for CVE-2026-61712

Vulnerability Information
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Vulnerability Title
BuildKit: Possible runtime DoS via unbounded group parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Moby BuildKit 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Moby BuildKit是Moby团队开源的一款容器镜像构建引擎。 Moby BuildKit 0.31.1之前版本存在资源管理错误漏洞，该漏洞可导致buildkitd进程因内存不足而终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
moby buildkit < 0.31.1 -

II. Public POCs for CVE-2026-61712

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III. Intelligence Information for CVE-2026-61712

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Patches & Fixes for CVE-2026-61712 (2)

Vendor Advisories for CVE-2026-61712 (1)

Other References for CVE-2026-61712 (1)

Same Patch Batch · moby · 2026-08-19 · 3 CVEs total

CVE-2026-75593 7.2 HIGH BuildKit: Malicious client can bypass destination directory validation on local sources up
CVE-2026-61711 5.3 MEDIUM BuildKit: Custom frontend could bypass Seccomp/AppArmor

IV. Related Vulnerabilities

Same product: buildkit
Same vendor: moby
Same weakness: CWE-770

V. Comments for CVE-2026-61712

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