High severity7.5NVD Advisory· Published Sep 21, 2018· Updated Jun 17, 2026
CVE-2018-14731
CVE-2018-14731
Description
An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1 connection (with a random TCP port number) from any origin. The random port number can be found by connecting to http://127.0.0.1 and reading the "new WebSocket" line in the source code.
AI Insight
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
parcel-bundlernpm | < 1.10.0 | 1.10.0 |
Affected products
1Patches
Vulnerability mechanics
References
8- blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20MessagesnvdExploitThird Party AdvisoryWEB
- github.com/parcel-bundler/parcel/pull/1794nvdExploitPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-37q6-576q-vgr7ghsaADVISORY
- github.com/parcel-bundler/parcel/issues/1783nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2018-14731ghsaADVISORY
- blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20Messages)ghsaWEB
- github.com/parcel-bundler/parcel/commit/066e0bf6bd26b15c78bd47df023452e4b20073e4ghsaWEB
- www.npmjs.com/advisories/721ghsaWEB
News mentions
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