Is there a public exploit for CVE-2026-121751?

No public exploit for CVE-2026-121751 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121751?

CVE-2026-121751 scores CVSS 2.1 (v4.0), rated low.

What does CVE-2026-121751 affect?

CVE-2026-121751 affects nvm-sh nvm.

2.1 Low

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions.

CVE-2026-121751

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.39.6 through 0.40.8, nvm ls-remote (and other commands that refresh remote LTS aliases) store the version column of the mirror's index.tab in $NVMDIR/alias/lts/ without validating it, and nvmnormalizelts later evaluates any suffix of an lts/-N value inside shell arithmetic $((N+1)). Under bash and zsh, arithmetic evaluation expands command substitutions in array subscripts, so a stored value such as lts/-10path[$(cmd)1] runs cmd as the user when the alias is later resolved by purely local commands (nvm ls, nvm alias, nvm use --lts, nvm which lts/), and in every new shell when the default alias is lts/. Exploitation requires the victim to use a hostile mirror -- via a compromised mirror or CDN, a network man-in-the-middle of an http:// mirror, or a maliciously configured NVMNODEJSORGMIRROR -- and to run an affected command. The same sink is also reachable from a project .nvmrc, which is treated as hardening. dash is not affected. Version 0.41.0 only passes an all-digit lts/-N offset to arithmetic and drops index.tab rows whose version is not a valid version string.

Assessment

CVSS: 2.1 (v4.0)
Severity: Low
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: nvm-sh · nvm
Assigner: harborist

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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