# CVE-2026-17495: moment vulnerable to Path Traversal via crafted non-string locale name

> Attackers can execute arbitrary code by passing crafted non-string objects to moment.locale(), bypassing path traversal guards in server-side applications.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** CLEANSTART-2026-FU60890, CLSA-2026-1793190763, DEBIAN-CVE-2026-17495, ECHO-4992-a84d-e0aa, GHSA-4p3w-j4w9-5jqw, MINI-2wmq-xrc8-r6hf, MINI-3phx-mfrv-xgpw, MINI-4cf7-xh75-7fvf, MINI-4h2g-5w43-fc6r, MINI-4m2q-ccx2-45g6, MINI-59m9-r8jc-g52x, MINI-5pp7-fvwj-mxfj, MINI-5q54-fv7p-h8mh, MINI-68m2-7v46-68wf, MINI-697x-8m33-w3g4, MINI-6vjm-wh83-v46w, MINI-8qxp-pw83-p9fj, MINI-fhrr-xmjq-qmg7, MINI-fjqw-4hx6-5w82, MINI-hc9v-r3x2-29qw, MINI-hffx-q3j3-7xc7, MINI-hw75-pg2h-6v37, MINI-hx2v-qc4c-v969, MINI-jj5g-m6ph-m457, MINI-mcp7-vr75-r273, MINI-vcm6-5wrx-p4p3, MINI-vfpc-pqh3-97h4, MINI-w55w-3725-5q26, MINI-wgqh-hpcg-qcgg, MINI-x82p-8w5h-fq58, MINI-xrcv-r223-r67r, UBUNTU-CVE-2026-17495

## What is CVE-2026-17495?

CVE-2026-17495 is a medium-severity path traversal vulnerability in moment, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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().

Weakness: CWE-27 (Path Traversal: 'dir/../../filename')

## Which versions are affected by CVE-2026-17495?

2 open source packages ship an affected version, including moment.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `moment` | npm | From 2.29.2 | 2.31.0 |
| `moment` | npm | From 2.29.2 | 2.31.0 |

## How do I fix CVE-2026-17495?

Upgrade moment to 2.31.0 or later.

## Is CVE-2026-17495 being exploited?

There is no known exploitation of CVE-2026-17495 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17495 and fix it if it is affected.

What it is: CVE-2026-17495 is a medium-severity path traversal vulnerability in moment, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-17495 in the wild and no public exploit code.

Affected packages and fixed versions:
- moment (npm): affected from 2.29.2; fixed in 2.31.0
- moment (npm): affected from 2.29.2; fixed in 2.31.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-17495/ (Markdown: https://insights.sbomify.com/CVE-2026-17495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17495
- OSV: https://osv.dev/vulnerability/CVE-2026-17495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-17495/
Summaries are generated and may contain mistakes; the official description above is the record.