{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-118905", "assignerOrgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "state": "PUBLISHED", "assignerShortName": "harborist", "dateReserved": "2026-10-29T05:21:07.784Z", "datePublished": "2026-10-29T05:22:35.156Z", "dateUpdated": "2026-10-29T05:22:35.156Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158", "shortName": "harborist", "dateUpdated": "2026-10-29T05:22:35.156Z" }, "title": "nvm_ls lets an untrusted version string inject sed commands, executing arbitrary commands with GNU sed", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-78", "description": "CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "type": "CWE" } ] }, { "descriptions": [ { "lang": "en", "cweId": "CWE-94", "description": "CWE-94 Improper Control of Generation of Code ('Code Injection')", "type": "CWE" } ] } ], "affected": [ { "vendor": "nvm-sh", "product": "nvm", "repo": "https://github.com/nvm-sh/nvm", "versions": [ { "status": "affected", "version": "0.31.2", "lessThan": "0.40.6", "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 0.31.2 through 0.40.5, `nvm_ls` filters installed versions with a sed program that embeds the requested version pattern in a `\\#...#` address, escaping `.` (and, since 0.40.4, `#`) but not backslash. A version string containing `#` (or `\\#`) therefore closes the address early, and the rest of it is parsed as sed commands: with GNU sed, the `e` command runs a shell command as the user; with BSD sed, the `w` and `r` commands write and read files. This is reachable whenever an attacker-influenced version string is passed to `nvm use`, `nvm which`, `nvm ls`, `nvm version`, `nvm run`, or `nvm exec`, or to `nvm-exec` via `NODE_VERSION`, and at least one version is installed. nvm's own `.nvmrc` parser strips comments, so a bare `nvm use` is not affected; however, the bash `cdnvm` and zsh `load-nvmrc` auto-switch hooks documented in the README read `.nvmrc` as-is and pass it to `nvm ls` and `nvm version`, so a user with one of those hooks installed runs the attacker's command just by changing into a directory under a malicious `.nvmrc`; scripts that run `nvm use \"$(cat .nvmrc)\"` are affected the same way. Version 0.40.6 passes any version pattern containing `#` or a newline through the `.nvmrc` content parser first, so no `#` reaches the sed program.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.31.2 through 0.40.5, `nvm_ls` filters installed versions with a sed program that embeds the requested version pattern in a `\\#...#` address, escaping `.` (and, since 0.40.4, `#`) but not backslash. A version string containing `#` (or `\\#`) therefore closes the address early, and the rest of it is parsed as sed commands: with GNU sed, the `e` command runs a shell command as the user; with BSD sed, the `w` and `r` commands write and read files. This is reachable whenever an attacker-influenced version string is passed to `nvm use`, `nvm which`, `nvm ls`, `nvm version`, `nvm run`, or `nvm exec`, or to `nvm-exec` via `NODE_VERSION`, and at least one version is installed. nvm's own `.nvmrc` parser strips comments, so a bare `nvm use` is not affected; however, the bash `cdnvm` and zsh `load-nvmrc` auto-switch hooks documented in the README read `.nvmrc` as-is and pass it to `nvm ls` and `nvm version`, so a user with one of those hooks installed runs the attacker's command just by changing into a directory under a malicious `.nvmrc`; scripts that run `nvm use \"$(cat .nvmrc)\"` are affected the same way. Version 0.40.6 passes any version pattern containing `#` or a newline through the `.nvmrc` content parser first, so no `#` reaches the sed program.

" } ] } ], "references": [ { "url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-vgqf-vc3m-4wv3", "name": "GHSA-vgqf-vc3m-4wv3", "tags": [ "vendor-advisory" ] }, { "url": "https://github.com/nvm-sh/nvm/commit/82315e2b189528a006da6701eac30e8c364ffd22", "name": "Fix commit 82315e2b", "tags": [ "patch" ] }, { "url": "https://github.com/nvm-sh/nvm/pull/3854", "name": "nvm-sh/nvm#3854", "tags": [ "patch" ] }, { "url": "https://github.com/nvm-sh/nvm/releases/tag/v0.40.6", "name": "v0.40.6", "tags": [ "release-notes" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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": "HIGH", "baseScore": 7.1, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H" } } ], "workarounds": [ { "lang": "en", "value": "Until upgrading, do not pass untrusted version strings to nvm, and use nvm's own `.nvmrc` handling (a bare `nvm use`) instead of reading `.nvmrc` yourself, including in shell auto-switch hooks.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

Until upgrading, do not pass untrusted version strings to nvm, and use nvm's own `.nvmrc` handling (a bare `nvm use`) instead of reading `.nvmrc` yourself, including in shell auto-switch hooks.

" } ] } ], "solutions": [ { "lang": "en", "value": "Upgrade to nvm 0.40.6 or later.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "

Upgrade to nvm 0.40.6 or later.

" } ] } ], "credits": [ { "lang": "en", "value": "vnth4nhnt of CyStack (https://github.com/vnth4nhnt)", "type": "finder" }, { "lang": "en", "value": "sjh9714 (https://github.com/sjh9714)", "type": "remediation developer" } ], "source": { "advisory": "GHSA-vgqf-vc3m-4wv3", "discovery": "EXTERNAL" } } } }