EUVD-2026-78277Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
AC:H because crafting a non-string object with divergent match()/toString() is not achievable via standard JSON input, limiting practical attack paths; integrity-only impact reflects arbitrary module loading via require().
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
Lifecycle Timeline
4DescriptionCVE.org
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().
AnalysisAI
Path-traversal guard bypass in moment.js 2.29.2-2.30.1 allows a remote unauthenticated attacker (in server-side Node.js contexts) to supply a crafted non-string object to moment.locale() that satisfies the string-assuming guard via a custom match() method while its toString() returns a traversal path - delivering attacker-controlled path segments to an internal require() call. This is an incomplete fix for CVE-2022-24785 and is resolved in version 2.31.0; no public exploit has been identified at time of analysis.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a server-side Node.js application using moment 2.29.2-2.30.1 that passes user-controlled input directly to moment.locale() without first validating it is a primitive string type. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 score of 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N) is reasonable: AC:H reflects that constructing a non-string JavaScript object with divergent match()/toString() behaviors cannot be achieved through standard JSON deserialization alone (JSON cannot encode method overrides), materially limiting the attack surface to applications with additional deserialization or object-construction vectors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to moment 2.31.0 or later; this is a vendor-released patch confirmed by GitHub Security Advisory GHSA-4p3w-j4w9-5jqw and EUVD-2026-78277. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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