CVE-2026-15921Public exploitNetwork attack vector

Arbitrary file write via unvalidated LTS codename

Published Jul 15, 2026 · Updated Jul 15, 2026

Path traversal in nvm 0.32.1 through 0.40.5 allows remote attackers to overwrite user files through a hostile Node.js mirror. nvm_ls_remote_index_tab uses the mirror's index.tab LTS codename as an alias filename, and nvm_make_alias writes it beneath the alias path without rejecting traversal. A user must run an LTS-alias-refreshing command against a malicious, compromised, or intercepted mirror; overwriting a shell startup file executes commands in a later shell session.

CVSS severity2.1
Low
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in nvm 0.32.1 through 0.40.5 allows remote attackers to overwrite user files through a hostile Node.js mirror. nvm_ls_remote_index_tab uses the mirror's index.tab LTS codename as an alias filename, and nvm_make_alias writes it beneath the alias path without rejecting traversal. A user must run an LTS-alias-refreshing command against a malicious, compromised, or intercepted mirror; overwriting a shell startup file executes commands in a later shell session.

The record

CVE
CVE-2026-15921
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
nvm-sh
Product
nvm
Classifications
CWE-22, CWE-73, T1546.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.32.1 <0.40.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

nvm-sh · nvmversion=0.32.1 <0.40.6

Published CVSS scores

3.1nvm-shCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
2.1harboristCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73External Control of File Name or Path
T1546.004Unix Shell Configuration Modification

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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