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CVE-2026-121750

nvm install --offline installs a cached tarball that previously failed checksum verification

Products / packages nvm-sh nvm

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 23:15:31 UTC
harborist · CVSS:4.0 · 2.1
Assessment 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
harborist · CVSS:3.1 · 3.1
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

low3.1

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

Node Version Manager (nvm) versions 0.40.5 through 0.40.8 install a cached tarball without checksum verification when using `nvm install --offline`, allowing code execution if an attacker can alter the downloaded tarball. The attacker must have access to the download process. The weakness is due to incomplete cleanup and download of code without integrity check.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

nvm-sh · harborist

nvm

1 range
harborist version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0.40.5 → before 0.41.0

semver versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Upgrade to nvm 0.41.0 or later, which removes an archive that fails verification instead of caching it.

harborist guidance ↗

Until upgrading, after any "Checksums do not match" error, run nvm cache clear before using nvm install --offline.

harborist guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.40.5 through 0.40.8, nvm_download_artifact downloads a release archive directly to its final path in $NVM_DIR/.cache and verifies its checksum afterwards; on a checksum mismatch it reports an error but leaves the rejected archive in place. A later nvm install --offline of the same version installs that cached file without a checksum, so an archive that was just rejected gets installed and its node and npm run. This gives code execution to a party who can alter the downloaded tarball (for example a poisoned CDN or cache object) but cannot also forge the SHASUMS256.txt beside it, if the victim runs nvm install --offline for that version after the visible "Checksums do not match" failure and before any online retry. Version 0.41.0 only puts an archive in the cache once its checksum has passed.

References

2 sources
nvm-sh/nvm · security/advisories/GHSA-262q-c465-prmr
Vendor advisoryharborist
nvm-sh/nvm · commit 1f99e4c
Patchharborist

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-121750

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-494 ↗

CWE-494 Download of Code Without Integrity Check

harborist

Related →
CWE-459 ↗

CWE-459 Incomplete Cleanup

harborist

Related →
Contributing organizations · 2
harborist

Assigning organization

2026-11-04
CISA-ADP

Additional data publisher

2026-11-09

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-121750

    Observed 2026-11-09T20:56:01.362Z · upstream updated 2026-11-09T20:47:07.647Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-09T20:46:55.193978Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.