CVE-2026-53970 ZeroBrew version 0.3.1 and prior Missing Checksum Verification RCE via shim.rb
Attackers can execute arbitrary code by substituting malicious content in package downloads due to missing checksum verification in ZeroBrew.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-53970?
CVE-2026-53970 is a high-severity vulnerability in lucasgelfond ZeroBrew, published on 14 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-494
Which versions are affected by CVE-2026-53970?
How do I fix CVE-2026-53970?
No fix has been published for CVE-2026-53970 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-53970 being exploited?
There is no known exploitation of CVE-2026-53970 in the wild and no public exploit code.
Sources
Also known as GHSA-9pp6-v7j8-j65j.