CVE-2026-15921

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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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpg", "name": "GHSA-4ghp-wxpw-rhpg", "tags": ["vendor-advisory"]}, {"url": "https://github.com/nvm-sh/nvm/commit/9275c5badda1d9d0cdad6f34598a111033eadb42", "name": "Fix commit 9275c5ba", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "LOW", "baseScore": 2.1, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "LOW", "baseScore": 3.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"}}], "workarounds": [{"lang": "en", "value": "Until upgrading, only run `nvm ls-remote` and LTS-refreshing commands against trusted mirrors over TLS, and ensure `NVM_NODEJS_ORG_MIRROR` and `NVM_IOJS_ORG_MIRROR` point only at trusted endpoints.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Until upgrading, only run `nvm ls-remote` and LTS-refreshing commands against trusted mirrors over TLS, and ensure `NVM_NODEJS_ORG_MIRROR` and `NVM_IOJS_ORG_MIRROR` point only at trusted endpoints.</p>"}]}], "solutions": [{"lang": "en", "value": "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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(Only needed if using a non-default mirror whose metadata contents you do not trust).</p>"}]}], "credits": [{"lang": "en", "value": "Sy2n0 (https://github.com/Sy2n0)", "type": "finder"}, {"lang": "en", "value": "Jordan Harband (https://github.com/ljharb)", "type": "remediation developer"}], "source": {"advisory": "GHSA-4ghp-wxpw-rhpg", "discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"references": [{"url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpg", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-16T12:53:15.866939Z", "id": "CVE-2026-15921", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-16T12:53:35.897Z"}}]}}

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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. 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En las versiones 0.32.1 a 0.40.5, \u2019nvm ls-remote\u2019 (y otros comandos que actualizan alias LTS remotos, como \u2019nvm install --lts\u2019) analizan el \u2019index.tab\u2019 del mirror de node.js y usan el campo de nombre en clave LTS de cada lanzamiento como un nombre de archivo de alias sin validarlo. Un mirror malicioso, comprometido o con un ataque de man-in-the-middle puede devolver un nombre en clave LTS que contenga secuencias de path-traversal como \u2019.. / .. / .. / .bashrc\u2019, haciendo que nvm escriba la cadena de versi\u00f3n asociada a una ruta fuera de \u2019$NVM_DIR/alias\u2019. Con la configuraci\u00f3n predeterminada (\u2019$NVM_DIR\u2019 es \u2019~/.nvm\u2019), esto puede crear o sobrescribir archivos en el directorio de inicio del usuario, incluidos los archivos de inicio de shell, lo que puede llevar a la ejecuci\u00f3n de c\u00f3digo en una sesi\u00f3n de shell posterior. La explotaci\u00f3n requiere que la v\u00edctima use un mirror hostil -- a trav\u00e9s de un mirror o CDN comprometido, un man-in-the-middle de red, o un \u2019NVM_NODEJS_ORG_MIRROR\u2019/\u2019NVM_IOJS_ORG_MIRROR\u2019 configurado maliciosamente -- y que ejecute un comando afectado. La versi\u00f3n 0.40.6 valida los nombres en clave LTS remotos como nombres de archivo de alias seguros y rechaza los componentes de ruta \u2019..\u2019 al escribir archivos de alias."}], "id": "CVE-2026-15921", "lastModified": "2026-10-24T21:10:00.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.1, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 1.4, "source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-15921", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-16T12:53:15.866939Z", "version": "2.0.3"}}]}, "published": "2026-07-15T22:16:45.717", "references": [{"source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "url": "https://github.com/nvm-sh/nvm/commit/9275c5badda1d9d0cdad6f34598a111033eadb42"}, {"source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpg"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpg"}], "sourceIdentifier": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-73"}], "source": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.32.1,0.40.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "nvm", "source": "cna", "vendor": "nvm-sh"}, "product": "nvm", "vendor": "nvm-sh"}], "created": "2026-07-15T23:00:15.022040+00:00", "updated": "2026-07-31T02:45:04.357866+00:00", "vendors": ["nvm-sh", "nvm-sh$PRODUCT$nvm"]}