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CVE-2026-121751: Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions

11
Routine
LOW 3.1UPGRADE

CVE-2026-121751 is a low-severity flaw (CVSS 3.1) affecting nvm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 `$NVM_DIR/alias/lts/` without validating it, and `nvm_normalize_lts` later evaluates any suffix of an `lts/-N` value inside shell arithmetic `$((N+1))`. Under bash and zsh, arithmetic eva

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score3.1 (Low)
EPSS exploit chancen/a
CISA exploited listNo
WeaknessCWE-78, CWE-20
Published2026-11-04
Last modified2026-11-04
Publisher (CNA): harborist · Vendor: nvm-sh · Source: CVE Program record (NVD analysis pending)

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Last updated 2026-11-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

nvm-sh nvm UPGRADE
Affected: >= 0.39.6 and < 0.41.0
Fixed in: 0.41.0
Safe to downgrade to: a release before 0.39.6
1. Check installed version
apt-cache policy nvm || rpm -q nvm || nvm --version
2. UPGRADE to 0.41.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade nvm
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade nvm
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 0.39.6 (Debian / Ubuntu)
apt-cache madison nvm sudo apt install nvm=<VERSION_BEFORE_0.39.6> sudo apt-mark hold nvm
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list nvm sudo dnf downgrade nvm-<VERSION_BEFORE_0.39.6> sudo dnf versionlock add nvm
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-121751?

nvm: upgrade to 0.41.0. Exact commands for each OS are on this page.

Is CVE-2026-121751 being exploited?

CVE-2026-121751 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-121751 affect?

CVE-2026-121751 affects nvm. Severity is low (CVSS 3.1). 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 m

How urgent is CVE-2026-121751?

Priority 11/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

Related CVEs

References

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