nvm-sh Nvm up to 0.40.8 Downloader nvm_download NVM_AUTH_HEADER information disclosure

Summaryinfo

A vulnerability was found in nvm-sh Nvm up to 0.40.8. It has been declared as problematic. This issue affects the function nvm_download of the component Downloader. Executing a manipulation of the argument NVM_AUTH_HEADER can lead to information disclosure. This vulnerability appears as CVE-2026-121745. The attack requires local access. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in nvm-sh Nvm up to 0.40.8 and classified as problematic. This vulnerability affects the function nvm_download of the component Downloader. The manipulation of the argument NVM_AUTH_HEADER with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-121745 since 11/04/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 0.41.0 eliminates this vulnerability.

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Productinfo

Vendor

• nvm-sh

Name

• Nvm

Version

• 0.40.0
• 0.40.1
• 0.40.2
• 0.40.3
• 0.40.4
• 0.40.5
• 0.40.6
• 0.40.7
• 0.40.8

Website

• Product: https://github.com/nvm-sh/nvm/

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