Is webpack safe ? 4 known vulnerabilities, worst severity CRITICAL.
// reach 75 direct dependencies
10 carry known advisories, worst CRITICAL
224 packages depend on it
an advisory here reaches each of them
// ai model usage Tracked for PyPI packages. HuggingFace models declare Python dependencies, so npm packages are not covered.
cvss CVSS v3.1 base score out of 10
epss chance of exploitation in 30 days, 73rd percentile of all CVEs
xyz score CyberXYZ composite out of 10
fig. 01 — GHSA-hc6q-2mpp-qw7j, the advisory selected below
// 4 advisories GHSA-hc6q-2mpp-qw7j Webpack 5 before 5.76.0 does not avoid cross-realm object access. ImportParserPlugin.js mishandles the magic comment feature. An attacker who controls a property of an untrusted object can obtain access to the real global object. CRIT GHSA-4vvj-4cpr-p986 We discovered a DOM Clobbering vulnerability in Webpack’s AutoPublicPathRuntimeModule. The DOM Clobbering gadget in the module can lead to cross-site scripting (XSS) in web pages where scriptless attacker-controlled HTML elements (e.g., an img tag with an unsanitized name attribute) are present. MODE GHSA-8fgc-7cc6-rx7x When experiments.buildHttp is enabled, webpack’s HTTP(S) resolver (HttpUriPlugin) can be bypassed to fetch resources from hosts outside allowedUris by using crafted URLs that include userinfo (username:password@host). If allowedUris enforcement relies on a raw string prefix check (e.g., uri.startsWith(allowed)), a URL that looks allow-listed can pass validation while the actual network request is LOW GHSA-38r7-794h-5758 When experiments.buildHttp is enabled, webpack’s HTTP(S) resolver (HttpUriPlugin) enforces allowedUris only for the initial URL, but does not re-validate allowedUris after following HTTP 30x redirects. As a result, an import that appears restricted to a trusted allow-list can be redirected to HTTP(S) URLs outside the allow-list. This is a policy/allow-list bypass that enables build-time SSRF behav LOW Webpack 5 before 5.76.0 does not avoid cross-realm object access. ImportParserPlugin.js mishandles the magic comment feature. An attacker who controls a property of an untrusted object can obtain access to the real global object.
// cvss v3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High Checked 2026-11-06 at 21:59 UTC. The most recent advisory here was published 2026-02-05. Updated continuously from NVD, GHSA, OSV and CNA feeds.
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