{"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"}}}}