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moment vulnerable to Path Traversal via crafted non-string locale name

Moderate
mattjohnsonpint published GHSA-4p3w-j4w9-5jqw Sep 15, 2026

Package

npm moment (npm)

Affected versions

>= 2.29.2, < 2.31.0

Patched versions

2.31.0

Description

Impact

moment before 2.31.0 is vulnerable to path traversal in moment.locale(). When an application passes a non-string, attacker-influenced value to moment.locale(), a specially crafted object can bypass the locale name validation and cause moment to load a file from an attacker-controlled path. This is a further bypass of the validation added in 2.29.2 for CVE-2022-24785.

This affects server-side (npm) users only. Plain string input is not affected: the existing validation correctly rejects strings that contain path separators.

Patches

This issue is patched in moment 2.31.0.

Workarounds

Validate that any user-supplied input is a string before passing it to moment.locale().

References

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVE ID

CVE-2026-17495

Weaknesses

Path Traversal: 'dir/../../filename'

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize multiple internal ../ sequences that can resolve to a location that is outside of that directory. Learn more on MITRE.

Credits