lucasgelfond ZeroBrew up to 0.3.1 Checksum Validation shim.rb data authenticity

Summaryinfo

A vulnerability identified as critical has been detected in lucasgelfond ZeroBrew up to 0.3.1. This affects an unknown function of the file shim.rb of the component Checksum Validation. The manipulation leads to data authenticity. This vulnerability is referenced as CVE-2026-53970. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in lucasgelfond ZeroBrew up to 0.3.1. This issue affects some unknown functionality of the file shim.rb of the component Checksum Validation. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-53970 since 06/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• lucasgelfond

Name

• ZeroBrew

Version

• 0.3.0
• 0.3.1

CPE 2.3info

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CPE 2.2info

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