Is there a public exploit for CVE-2026-121749?

No public exploit for CVE-2026-121749 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121749?

CVE-2026-121749 scores CVSS 4.6 (v4.0), rated medium.

4.6 Medium

Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions.

CVE-2026-121749

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 nvmlsremoteindextab, nvmremoteversion, and nvmlscached. 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.

Assessment

CVSS: 4.6 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 9 November 2026
Weakness: CWE-88
Assigner: 7ffcee3d-2c14-4c3e-b844-86c6a321a158

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/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

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