Summary
moment vulnerable to Path Traversal via crafted non-string locale name
Workarounds
Validate that any user-supplied input is a string before passing it to moment.locale().
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.
CVE-2026-17495 has a CVSS score of 5.9 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.31.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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This issue is patched in moment 2.31.0.
Frequently Asked Questions
- What is CVE-2026-17495? CVE-2026-17495 is a medium-severity security vulnerability in moment (npm), affecting versions >= 2.29.2, < 2.31.0. It is fixed in 2.31.0.
- How severe is CVE-2026-17495? CVE-2026-17495 has a CVSS score of 5.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of moment are affected by CVE-2026-17495? moment (npm) versions >= 2.29.2, < 2.31.0 is affected.
- Is there a fix for CVE-2026-17495? Yes. CVE-2026-17495 is fixed in 2.31.0. Upgrade to this version or later.
- Is CVE-2026-17495 exploitable, and should I be worried? Whether CVE-2026-17495 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-17495 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-17495? Upgrade
momentto 2.31.0 or later.