Threat Intelligence Database

Node Version Manager (nvm) versions 0.32.1 through 0.40.5 contain a path traversal vulnerability in commands that refresh remote LTS aliases, such as `nvm ls-remote` and `nvm install --lts`. This occurs because nvm uses the LTS codename from the node.js mirror as an alias filename without validating it, allowing a malicious mirror to cause files outside the intended directory to be overwritten. Exploitation requires use of a hostile mirror and running an affected command. Version 0.40.6 and later validate these codenames to prevent this issue.

nvm (Node Version Manager) through 0.40.4 executes arbitrary commands from version strings supplied by the configured Node.js/io.js mirror. Commands such as `nvm install` read the available versions from the mirror's index.tab and use the selected version, without sanitization, to build download URLs and shell/awk commands. Two sinks are affected by the same untrusted input: nvm_download() built a curl/wget command string and ran it with `eval`, so a version field containing command substitution (for example $(id)) was executed by the local shell; and nvm_get_checksum() interpolated the version-derived download slug into an awk program, so a crafted version could execute arbitrary commands via awk's system(). An attacker who controls the configured mirror, supplies mirror content to a user or CI on a non-default mirror, or machine-in-the-middles a non-TLS mirror can ∴ run arbitrary commands with the privileges of the user running nvm. The default mirror (https://nodejs.org over TLS) is not affected. Fixed on master (pending the next tagged release) by passing every argument as a literal argv element instead of using eval, by passing the value to awk as data via -v instead of interpolating it into the program, and by rejecting any version outside the Node.js/io.js version grammar before it is used.

CVE-2026-1665 is a command injection vulnerability in nvm (Node Version Manager) versions 0.40.3 and below. The vulnerability arises because the nvm_download() function uses eval to execute wget commands without properly sanitizing the NVM_AUTH_HEADER environment variable. An attacker who can control environment variables in a victim’s shell environment—such as through malicious CI/CD configurations, compromised dotfiles, or Docker images—can inject arbitrary shell commands. These commands execute when the victim runs nvm commands that trigger downloads, like 'nvm install' or 'nvm ls-remote'. The CVSS 4.0 score is 5.4 (medium severity), reflecting the need for local privileges and user interaction. There are no known exploits in the wild yet.

MediumVulnerabilityGermanyFranceNetherlands+4#cve#cve-2026-1665#cwe-78