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CVE-2026-121745
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.
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The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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