CVE-2026-15921

LOWPre-NVD 3.13.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This low-severity CVE scores 3.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (25th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
3.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 3.1Exploit: No code on recordExposed services: Not assessed

Upgrade to nvm 0.40.6 or later, which validates remote LTS codenames and rejects `..` path components when writing alias files (from the CVE record's solution, Harborist) — apply it.

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.32.1 through 0.40.5, nvm ls-remote (and other commands that refresh remote LTS aliases, such as nvm install --lts) parse the node.js mirror's index.tab and use each release's LTS codename field as an alias filename without validating it. A malicious, compromised, or man-in-the-middled mirror can return an LTS codename containing path-traversal sequences such as ../../../.bashrc, causing nvm to write the associated version string to a path outside $NVM_DIR/alias. With the default layout ($NVM_DIR is ~/.nvm), this can create or overwrite files in the user's home directory, including shell startup files, which can lead to code execution in a later shell session. Exploitation requires the victim to use a hostile mirror -- via a compromised mirror or CDN, a network man-in-the-middle, or a maliciously configured NVM_NODEJS_ORG_MIRROR/NVM_IOJS_ORG_MIRROR -- and to run an affected command. Version 0.40.6 validates remote LTS codenames as safe alias filenames and rejects .. path components when writing alias files.

CVSS v3
3.1
EG Score
3.1LOWmedium confidence
EG Risk
30
EG Risk 30/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity31% × 45%
The EG Score, 3.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: Upgrade to nvm 0.40.6 or later, which validates remote LTS codenames and rejects `..` path components when writing alias files (from the CVE record's solution, Harborist). Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
25th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

Upgrade to nvm 0.40.6 or later, which validates remote LTS codenames and rejects `..` path components when writing alias files (from the CVE record's solution, Harborist). Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 15, 2026

Last Modified

July 16, 2026

References (2)

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 28× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 99 is merged into the row it repeats.

  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  18. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  1. 2026-09-18 04:42 UTCEG score recompute
  2. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  6. 2026-09-11 21:43 UTCEG score recompute
  7. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  13. 2026-09-05 20:45 UTCEG score recompute
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  72. 2026-07-15 21:24 UTCEG score recompute
  73. 2026-07-15 21:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15921?
CVE-2026-15921 is a low-severity vulnerability; its CVE record was published on July 15, 2026. Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.32.1 through 0.40.5, nvm ls-remote (and other commands that refresh remote LTS aliases, such as nvm install --lts) parse the node.js mirror's index.tab and use each release's LTS…
When was CVE-2026-15921 made public?
CVE-2026-15921 was made public on July 15, 2026: that is the date its CVE record's CNA, Harborist, gives for when the vulnerability was made public. The CVE record itself was published on July 15, 2026. EchelonGraph's copy of the record carries a last-modified date of July 16, 2026; the record at its source may have been updated since.
Is CVE-2026-15921 actively exploited?
CVE-2026-15921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15921?
CVE-2026-15921 has a CVSS base score of 3.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15921?
The CVE record's solution for CVE-2026-15921, written by its CNA Harborist, names the fix: "Upgrade to nvm 0.40.6 or later, which validates remote LTS codenames and rejects `..` path components when writing alias files."

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