GHSA-xmxw-6r9w-89gc: nvm passes the version pattern to grep without -e, letting a .nvmrc inject grep options and read local files

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.5.0 through 0.40.8, the requested version pattern is passed to grep as a bare argument, without -e, in nvmlsremoteindextab, nvmremoteversion, and nvmlscached. A .nvmrc whose first line starts with -, such as -Rohenpm[A-Za-z0-9], is parsed as grep options; with GNU grep, -R searches the current directory recursively (following symlinks) instead of the version list. On a bare nvm install, nvm then treats a matched string from those files as the version, prints it, and requests it from the configured mirror inside download URLs, so for example a repository containing a symlink to ../../.npmrc can leak the user's npm token to the terminal and to the mirror's and any proxy's logs. The disclosure is read-only and limited to the characters 0-9A-Za-z.+-. Version 0.41.0 passes every version pattern to grep with -e.