CVE-2026-17495
moment is a JavaScript date library for parsing, validating, manipulating, and formatting dates.
Impact
moment is a JavaScript date library for parsing, validating, manipulating, and formatting dates. In versions 2.29.2 through 2.30.1, a specially crafted non-string object passed to moment.locale() can bypass the locale-name path-traversal guard. The guard assumes the input is a string, so an object whose match() method satisfies the check while its toString() returns a traversal path reaches an internal require() call with attacker-controlled path segments. This is an incomplete fix for CVE-2022-24785 and primarily affects npm (server-side) users that pass user-provided input directly to moment.locale(). The issue is fixed in moment 2.31.0, and users should upgrade to 2.31.0 or later. As a workaround, validate that any user-supplied input is a string before passing it to moment.locale().
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | moment | >= 2.29.2, < 2.31.0 | 2.31.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4p3w-j4w9-5jqw
- https://github.com/moment/moment/security/advisories/GHSA-4p3w-j4w9-5jqw
- https://nvd.nist.gov/vuln/detail/CVE-2026-17495
- https://github.com/moment/moment/pull/6386
- https://github.com/moment/moment/commit/5f7d983c9881e65e07574de9dda3190d99520c07
- https://cna.openjsf.org/security-advisories.html
- https://github.com/moment/moment/releases/tag/2.31.0