{"id":"CVE-2026-53970","summary":"ZeroBrew version 0.3.1 and prior Missing Checksum Verification RCE via shim.rb","details":"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.","modified":"2026-08-16T03:48:29.911514093Z","published":"2026-08-14T15:32:29.878Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-494"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53970.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53970.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53970"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/zerobrew-version-and-prior-missing-checksum-verification-rce-via-shim-rb"},{"type":"REPORT","url":"https://github.com/lucasgelfond/zerobrew"},{"type":"FIX","url":"https://github.com/lucasgelfond/zerobrew/commit/89a60b73c7edd6b662e2a085be3d981b6ebeb1aa"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lucasgelfond/zerobrew","events":[{"introduced":"0"},{"fixed":"89a60b73c7edd6b662e2a085be3d981b6ebeb1aa"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"0.3.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.3.1","v0.3.0","v0.2.1","v0.2.0","v0.1.2","v0.1.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53970.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}