Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.40.0 through 0.40.8, when `NVM_AUTH_HEADER` is set, `nvm_download` passes the credential to curl or wget as a `--header \"Authorization: ...\"` command-line argument. Process arguments are visible to every local user (on Linux via `ps` or `/proc//cmdline` unless `/proc` is mounted with `hidepid=`; on macOS via `ps`), so another unprivileged account on the same machine can read the token while nvm is downloading during `nvm ls-remote`, `nvm install`, and similar commands, and gain whatever access it grants on the private mirror. Only users who set `NVM_AUTH_HEADER` on a host shared with other local accounts are affected. Version 0.41.0 passes the header to curl on stdin and to GNU Wget in a private temporary config file. BusyBox wget reads no config file, so when it is the only downloader available the header is still passed as an argument.
"}]}],"references":[{"url":"https://github.com/nvm-sh/nvm/security/advisories/GHSA-h3c2-g6gc-6cgx","name":"GHSA-h3c2-g6gc-6cgx","tags":["vendor-advisory"]},{"url":"https://github.com/nvm-sh/nvm/commit/903e3493699399d049f3af445c2d81688b6a7f5c","name":"Fix commit 903e3493","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"LOW","baseScore":2,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"LOW","baseScore":2.5,"vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"}}],"workarounds":[{"lang":"en","value":"Until upgrading, do not set `NVM_AUTH_HEADER` on machines shared with other local users, or mount `/proc` with `hidepid=2` on Linux.","supportingMedia":[{"type":"text/html","base64":false,"value":"Until upgrading, do not set `NVM_AUTH_HEADER` on machines shared with other local users, or mount `/proc` with `hidepid=2` on Linux.
"}]}],"solutions":[{"lang":"en","value":"Upgrade to nvm 0.41.0 or later, and on a machine shared with other local users make sure curl or GNU Wget is installed (BusyBox wget still receives the header as an argument).","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to nvm 0.41.0 or later, and on a machine shared with other local users make sure curl or GNU Wget is installed (BusyBox wget still receives the header as an argument).
"}]}],"credits":[{"lang":"en","value":"Anthropic's OSS Scanner, as vulnerability ANT-2026-540RL2U6","type":"finder"},{"lang":"en","value":"Jordan Harband (https://github.com/ljharb)","type":"remediation developer"}],"source":{"advisory":"GHSA-h3c2-g6gc-6cgx","discovery":"EXTERNAL"}}}}