ZeroBrew version 0.3.1 and prior contains a missing integrity verification vulnerability in the Ruby compatibility shim that allows network attackers to execute arbitrary code by substituting malicious content at formula resource or URL-based patch URLs without checksum validation. Attackers can intercept or replace downloads for secondary resource and patch paths in shim.rb, injecting attacker-controlled build steps or source tree modifications that execute during source builds via 'zb install --build-from-source' without any integrity warning.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
lucasgelfond ZeroBrew affected
Version Status Constraints
0 affected ≤ 0.3.1

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/lucasgelfond/zerobrew cve-icon cve-icon
https://github.com/lucasgelfond/zerobrew/commit/89a60b73c7edd6b662e2a085be3d981b6ebeb1aa cve-icon cve-icon
https://www.vulncheck.com/advisories/zerobrew-version-and-prior-missing-checksum-verification-rce-via-shim-rb cve-icon cve-icon
History

Fri, 14 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
Description ZeroBrew version 0.3.1 and prior contains a missing integrity verification vulnerability in the Ruby compatibility shim that allows network attackers to execute arbitrary code by substituting malicious content at formula resource or URL-based patch URLs without checksum validation. Attackers can intercept or replace downloads for secondary resource and patch paths in shim.rb, injecting attacker-controlled build steps or source tree modifications that execute during source builds via 'zb install --build-from-source' without any integrity warning.
Title ZeroBrew version 0.3.1 and prior Missing Checksum Verification RCE via shim.rb
Weaknesses CWE-494
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.5, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T15:32:29.878Z

Reserved: 2026-06-11T16:07:12.999Z

Link: CVE-2026-53970

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-14T16:16:57.073

Modified: 2026-08-14T16:16:57.073

Link: CVE-2026-53970

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T16:30:05Z

Weaknesses