nvm-sh nvm up to 0.40.4 nvm_download os command injection

Summaryinfo

A vulnerability classified as critical has been found in nvm-sh nvm up to 0.40.4. Impacted is the function nvm_download. This manipulation causes os command injection. This vulnerability is registered as CVE-2026-10796. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in nvm-sh nvm up to 0.40.4. It has been declared as critical. Affected by this vulnerability is the function nvm_download. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by Davidcarliez. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-10796 since 06/03/2026. The exploitation appears to be difficult. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/04/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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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

Website

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

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