CVE-2026-114348Medium· 5.3▾ SunlitA flaw was found in webpack-dev-server. An unauthenticated remote attacker can exploit improper Host header validation in the open-editor endpoint to obtain sensitive technical information. By sending a request with a specially crafted Hos…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
Last analysed / modified upstream
0.3%
A flaw was found in webpack-dev-server. An unauthenticated remote attacker can exploit improper Host header validation in the open-editor endpoint to obtain sensitive technical information. By sending a request with a specially crafted Host header, the attacker triggers an internal server error that returns a full error stack trace. This exposes environment details, including local file system paths, module locations, and internal source code references.
webpack-dev-server: webpack-dev-server: Information disclosure via malformed Host header — rated Moderate by Red Hat. Released 2026-10-22, updated 2026-10-23.
Not affected:
Refer to the advisory for fix availability.
Connected by shared product, vendor, weakness, or advisory.
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