01 Record

CVE-2026-15921

nvm path traversal via a malicious mirror's LTS codename writes outside the alias directory

LowPUBLISHEDCNA: harborist

CNA base score2.1 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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02 Description

nvm path traversal via a malicious mirror's LTS codename writes outside the alias directory

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 18.0% of scored records. A rank, not a probability.

NVD base score

2.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-10-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-07-15 21:16Z3 MO AGO

Last updated

2026-07-16 12:53Z3 MO AGO

Reserved

2026-07-15

Assigning CNA

harborist

Record state

PUBLISHED

Severity

Low (CVSS 2.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Weaknesses

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base
CWE-73External Control of File Name or PathBase

Data version

5.2

Document digest

c50048207a6cd8e159c45ae6d47aca7f3752f45141b1d71d4e72395d48ce9698

05 Affected products

VendorProductVersionsPlatforms

nvm-shnvm0.32.1 to < 0.40.6—

06 References

github.comGHSA-4ghp-wxpw-rhpghttps://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpgvendor-advisory
github.comFix commit 9275c5bahttps://github.com/nvm-sh/nvm/commit/9275c5badda1d9d0cdad6f34598a111033eadb42patch

07 Remediation

Upgrade to nvm 0.40.6 or later, which validates remote LTS codenames and rejects `..` path components when writing alias files. (Only needed if using a non-default mirror whose metadata contents you do not trust).