Vulnerability · Published Jan 28, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity prototype pollution in maker.js from microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)1.0%top 37.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	makerjs	0.19.2	GHSA-2cp6-34r9-54xx

Affected products (as reported)

Vendor	Product	Versions
microsoft	maker.js	<= 0.19.1

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

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