{"id":"CVE-2026-118905","published":"2026-10-29T06:17:20.343","lastModified":"2026-10-29T06:17:20.343","description":"Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.31.2 through 0.40.5, `nvm_ls` filters installed versions with a sed program that embeds the requested version pattern in a `\\#...#` address, escaping `.` (and, since 0.40.4, `#`) but not backslash. A version string containing `#` (or `\\#`) therefore closes the address early, and the rest of it is parsed as sed commands: with GNU sed, the `e` command runs a shell command as the user; with BSD sed, the `w` and `r` commands write and read files. This is reachable whenever an attacker-influenced version string is passed to `nvm use`, `nvm which`, `nvm ls`, `nvm version`, `nvm run`, or `nvm exec`, or to `nvm-exec` via `NODE_VERSION`, and at least one version is installed. nvm's own `.nvmrc` parser strips comments, so a bare `nvm use` is not affected; however, the bash `cdnvm` and zsh `load-nvmrc` auto-switch hooks documented in the README read `.nvmrc` as-is and pass it to `nvm ls` and `nvm version`, so a user with one of those hooks installed runs the attacker's command just by changing into a directory under a malicious `.nvmrc`; scripts that run `nvm use \"$(cat .nvmrc)\"` are affected the same way. Version 0.40.6 passes any version pattern containing `#` or a newline through the `.nvmrc` content parser first, so no `#` reaches the sed program.","cvssScore":7,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-78","CWE-94"],"vendors":[],"products":[],"references":[{"url":"https://github.com/nvm-sh/nvm/commit/82315e2b189528a006da6701eac30e8c364ffd22","tags":[]},{"url":"https://github.com/nvm-sh/nvm/pull/3854","tags":[]},{"url":"https://github.com/nvm-sh/nvm/releases/tag/v0.40.6","tags":[]},{"url":"https://github.com/nvm-sh/nvm/security/advisories/GHSA-vgqf-vc3m-4wv3","tags":[]}],"exploitRefs":[{"url":"https://github.com/nvm-sh/nvm/commit/82315e2b189528a006da6701eac30e8c364ffd22","tags":[]},{"url":"https://github.com/nvm-sh/nvm/pull/3854","tags":[]},{"url":"https://github.com/nvm-sh/nvm/releases/tag/v0.40.6","tags":[]},{"url":"https://github.com/nvm-sh/nvm/security/advisories/GHSA-vgqf-vc3m-4wv3","tags":[]}],"hasPoc":true,"ai":null}