{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121749", "assignerOrgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "state": "PUBLISHED", "assignerShortName": "harborist", "dateReserved": "2026-11-03T23:38:59.224Z", "datePublished": "2026-11-04T21:31:15.245Z", "dateUpdated": "2026-11-04T21:31:15.245Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "shortName": "harborist", "dateUpdated": "2026-11-04T21:31:15.245Z"}, "title": "nvm passes the version pattern to grep without -e, letting a .nvmrc inject grep options and read local files", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-88", "description": "CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')", "type": "CWE"}]}], "affected": [{"vendor": "nvm-sh", "product": "nvm", "repo": "https://github.com/nvm-sh/nvm", "versions": [{"status": "affected", "version": "0.5.0", "lessThan": "0.41.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.5.0 through 0.40.8, the requested version pattern is passed to `grep` as a bare argument, without `-e`, in `nvm_ls_remote_index_tab`, `nvm_remote_version`, and `nvm_ls_cached`. A `.nvmrc` whose first line starts with `-`, such as `-Rohenpm_[A-Za-z0-9]*`, is parsed as grep options; with GNU grep, `-R` searches the current directory recursively (following symlinks) instead of the version list. On a bare `nvm install`, nvm then treats a matched string from those files as the version, prints it, and requests it from the configured mirror inside download URLs, so for example a repository containing a symlink to `../../.npmrc` can leak the user's npm token to the terminal and to the mirror's and any proxy's logs. The disclosure is read-only and limited to the characters `0-9A-Za-z._+-`. Version 0.41.0 passes every version pattern to grep with `-e`.", "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 0.5.0 through 0.40.8, the requested version pattern is passed to `grep` as a bare argument, without `-e`, in `nvm_ls_remote_index_tab`, `nvm_remote_version`, and `nvm_ls_cached`. A `.nvmrc` whose first line starts with `-`, such as `-Rohenpm_[A-Za-z0-9]*`, is parsed as grep options; with GNU grep, `-R` searches the current directory recursively (following symlinks) instead of the version list. On a bare `nvm install`, nvm then treats a matched string from those files as the version, prints it, and requests it from the configured mirror inside download URLs, so for example a repository containing a symlink to `../../.npmrc` can leak the user's npm token to the terminal and to the mirror's and any proxy's logs. The disclosure is read-only and limited to the characters `0-9A-Za-z._+-`. Version 0.41.0 passes every version pattern to grep with `-e`.</p>"}]}], "references": [{"url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-xmxw-6r9w-89gc", "name": "GHSA-xmxw-6r9w-89gc", "tags": ["vendor-advisory"]}, {"url": "https://github.com/nvm-sh/nvm/commit/bce663e3873fadbe8ebbc6e07e8d76fb12d5d69e", "name": "Fix commit bce663e3", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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": "MEDIUM", "baseScore": 4.6, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "LOW", "baseScore": 3.3, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"}}], "workarounds": [{"lang": "en", "value": "Until upgrading, check that `.nvmrc` does not start with `-` before running nvm in an untrusted project directory.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Until upgrading, check that `.nvmrc` does not start with `-` before running nvm in an untrusted project directory.</p>"}]}], "solutions": [{"lang": "en", "value": "Upgrade to nvm 0.41.0 or later.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Upgrade to nvm 0.41.0 or later.</p>"}]}], "credits": [{"lang": "en", "value": "Anthropic's OSS Scanner, as vulnerability ANT-2026-EN9DM7WC", "type": "finder"}, {"lang": "en", "value": "Jordan Harband (https://github.com/ljharb)", "type": "remediation developer"}], "source": {"advisory": "GHSA-xmxw-6r9w-89gc", "discovery": "EXTERNAL"}}}}

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