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  4. CVE 2026 121748 nvm use delete prefix lets a project npmrc choose
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Back to active CVEs
Low · CVSS 1.8CVE-2026-121748

nvm use --delete-prefix lets a project .npmrc choose which file npm rewrites or makes world-writableCVE-2026-121748

Answer in brief

CVE-2026-121748 records a Low severity (CVSS 1.8) vulnerability in nvm use --delete-prefix lets a project .npmrc choose which file npm rewrites or makes world-writable. The current sources do not mark it as known exploited. The current feed maps nvm-sh/nvm (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 1.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 1.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps nvm-sh/nvm (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
nvm-sh/nvmgeneric>=0.27.0 <0.41.00.41.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for nvm-sh/nvm.
  2. 2Review the reported fix. Source-reported solution: Upgrade to nvm 0.41.0 or later.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.27.0 through 0.40.8, when a project's `.npmrc` sets `prefix`, `nvm use` tells the user to run `nvm use --delete-prefix`, which runs `npm config delete prefix` and `npm config delete globalconfig` in the current directory without naming a config file. npm loads the project `.npmrc` before deciding which file to edit, so that file chooses the target: `userconfig=~/.bashrc` makes npm rewrite `~/.bashrc` as ini (corrupting it), and `location=global` with `globalconfig=` leaves the chosen file at mode 0666, which on a shared machine lets another local user write to it. The attacker (the author of a cloned repository or archive, or a local user who can write a shared parent directory) chooses the file but not the bytes written, and no project code runs. Version 0.41.0 no longer lets a project `.npmrc` select which config file `--delete-prefix` edits.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • nvm use --save and nvm install --save write through a symlinked .nvmrc, overwriting any file the user can writeSame nvm-sh/nvm package
  • nvm prints the contents of any readable file through a symlinked .nvmrcSame nvm-sh/nvm package
  • nvm passes the version pattern to grep without -e, letting a .nvmrc inject grep options and read local filesSame nvm-sh/nvm package

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-73
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record