CVE-2026-121745

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CVE-2026-121745

Summary: nvm exposes NVM_AUTH_HEADER to other local users on the curl/wget command line

Details: 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: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121745.json, https://github.com/nvm-sh/nvm/security/advisories/GHSA-h3c2-g6gc-6cgx, https://nvd.nist.gov/vuln/detail/CVE-2026-121745, https://github.com/nvm-sh/nvm/commit/903e3493699399d049f3af445c2d81688b6a7f5c, https://github.com/nvm-sh/nvm