Vulnerability in Lucasgelfond Zerobrew
CVE-2026-53970
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.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Lucasgelfond Zerobrew — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53970?
- CVE-2026-53970 is a high-severity vulnerability in Lucasgelfond Zerobrew, classified under Download of Code Without Integrity Check. CVSS score: 7.5/10. Published 2026-08-14.
- How severe is CVE-2026-53970?
- High severity. CVSS v3 base score is 7.5 out of 10.