Bug 2567739 (CVE-2026-121750)

Summary: CVE-2026-121750 nvm: nvm: Arbitrary code execution via unverified cached archive installation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Node Version Manager (nvm). When downloading release archives, nvm stores the file directly in the local cache before performing checksum verification, leaving rejected archives in place when a checksum mismatch occurs. If a user subsequently attempts an offline installation for that version, nvm installs and runs binaries from the unverified cached archive without re-validating it. An attacker capable of tampering with downloaded archives could exploit this behavior to achieve arbitrary code execution on the victim's system.
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Description OSIDB Bzimport 2026-11-05 22:22:21 UTC 
Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.40.5 through 0.40.8, `nvm_download_artifact` downloads a release archive directly to its final path in `$NVM_DIR/.cache` and verifies its checksum afterwards; on a checksum mismatch it reports an error but leaves the rejected archive in place. A later `nvm install --offline` of the same version installs that cached file without a checksum, so an archive that was just rejected gets installed and its `node` and `npm` run. This gives code execution to a party who can alter the downloaded tarball (for example a poisoned CDN or cache object) but cannot also forge the `SHASUMS256.txt` beside it, if the victim runs `nvm install --offline` for that version after the visible "Checksums do not match" failure and before any online retry. Version 0.41.0 only puts an archive in the cache once its checksum has passed.