GHSA-mx8g-39q3-5c79Published

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Exploitation and risk

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cve-program · CVE-2026-9595

Published

Impact: When a user-configured proxy on webpack-dev-server has a broad context (e.g. /) and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket). Patches: Fixed in [email protected]. Workarounds: Scope user-defined proxy context to specific paths instead of /, or omit ws: true from the proxy entry when WebSocket forwarding is not required.

Source published: 15 Jun 2026 15:00:21 UTC
Source modified: 15 Jun 2026 16:08:35 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

euvd · EUVD-2026-36729

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 15, 2026, 3:00:21 PM

dateUpdated: Jun 15, 2026, 4:08:35 PM

16 related source bulletins · separate from aliases

RHSA-2026:37628: Red Hat Security Advisory: OpenShift Container Platform 4.20.29 bug fix and security update

CVE-2026-6322 · CVE-2026-9595 · CVE-2026-13676 · CVE-2026-44293

RHSA-2026:50357: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Container Release Update

CVE-2026-9595 · CVE-2026-11332 · CVE-2026-13149 · CVE-2026-34993 · CVE-2026-44545 · CVE-2026-55379 · CVE-2026-59869 · CVE-2026-59939

RHSA-2026:50479: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

CVE-2026-8643 · CVE-2026-9595 · CVE-2026-11332 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-18141 · CVE-2026-34993 · CVE-2026-40898 · CVE-2026-44545 · CVE-2026-48990 · CVE-2026-54058 · CVE-2026-54060 · CVE-2026-54283 · CVE-2026-55379 · CVE-2026-55380 · CVE-2026-59197 · CVE-2026-59869 · CVE-2026-59886 · CVE-2026-59939

RHSA-2026:57590: Red Hat Security Advisory: rh-podman-desktop security, bug fix, and enhancement update

CVE-2026-9595 · CVE-2026-12143 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-14257 · CVE-2026-34986 · CVE-2026-42338 · CVE-2026-42570 · CVE-2026-44705 · CVE-2026-45623 · CVE-2026-45736 · CVE-2026-45740 · CVE-2026-48068 · CVE-2026-48779 · CVE-2026-48801 · CVE-2026-49978 · CVE-2026-56876 · CVE-2026-59869 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59877 · CVE-2026-69152 · CVE-2026-69153 · CVE-2026-69192

RHSA-2026:41951: Red Hat Security Advisory: Red Hat Data Grid 8.6.2 security update

CVE-2026-6322 · CVE-2026-9595 · CVE-2026-12143 · CVE-2026-33245 · CVE-2026-34077 · CVE-2026-40983 · CVE-2026-40984 · CVE-2026-42211 · CVE-2026-42264 · CVE-2026-42342 · CVE-2026-42583 · CVE-2026-42586 · CVE-2026-42587 · CVE-2026-44248 · CVE-2026-44249 · CVE-2026-44250 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44495 · CVE-2026-44496 · CVE-2026-44890 · CVE-2026-44893 · CVE-2026-45292 · CVE-2026-45416 · CVE-2026-45674 · CVE-2026-46340 · CVE-2026-47691 · CVE-2026-48006 · CVE-2026-48043 · CVE-2026-48059 · CVE-2026-50010 · CVE-2026-50011 · CVE-2026-50193 · CVE-2026-54512 · CVE-2026-54513

RHSA-2026:41928: Red Hat Security Advisory: Red Hat Migration Toolkit for Containers

CVE-2025-7783 · CVE-2025-12816 · CVE-2025-13465 · CVE-2025-15284 · CVE-2025-52881 · CVE-2025-58183 · CVE-2025-58754 · CVE-2025-61726 · CVE-2025-61729 · CVE-2025-62718 · CVE-2025-66031 · CVE-2025-66418 · CVE-2025-66471 · CVE-2025-66506 · CVE-2025-68121 · CVE-2025-69223 · CVE-2025-69227 · CVE-2025-69228 · CVE-2026-4800 · CVE-2026-6322 · CVE-2026-9277 · CVE-2026-9595 · CVE-2026-12143 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-21441 · CVE-2026-22029 · CVE-2026-23490 · CVE-2026-23745 · CVE-2026-25679 · CVE-2026-25681 · CVE-2026-27136 · CVE-2026-27137 · CVE-2026-29063 · CVE-2026-30922 · CVE-2026-32280 · CVE-2026-32281 · CVE-2026-32283 · CVE-2026-33186 · CVE-2026-33810 · CVE-2026-33811 · CVE-2026-34986 · CVE-2026-39820 · CVE-2026-39821 · CVE-2026-40895 · CVE-2026-42264 · CVE-2026-42338 · CVE-2026-42499 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44495 · CVE-2026-44496 · CVE-2026-45736 · CVE-2026-45822 · CVE-2026-48779

RHSA-2026:66545: Red Hat Security Advisory: Red Hat AMQ Broker 7.13.6 release and security update

CVE-2026-9595 · CVE-2026-10050 · CVE-2026-10051 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-34478 · CVE-2026-34480 · CVE-2026-34481 · CVE-2026-40984 · CVE-2026-42198 · CVE-2026-42264 · CVE-2026-42338 · CVE-2026-42578 · CVE-2026-42581 · CVE-2026-42584 · CVE-2026-42587 · CVE-2026-42588 · CVE-2026-44248 · CVE-2026-44249 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44495 · CVE-2026-44496 · CVE-2026-45205 · CVE-2026-45416 · CVE-2026-45736 · CVE-2026-48779 · CVE-2026-49362 · CVE-2026-49363 · CVE-2026-49364 · CVE-2026-49432 · CVE-2026-49978 · CVE-2026-50010 · CVE-2026-50734 · CVE-2026-53916 · CVE-2026-54512 · CVE-2026-54513 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-56745 · CVE-2026-56746 · CVE-2026-57822 · CVE-2026-57967 · CVE-2026-59869 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59888 · CVE-2026-59899 · CVE-2026-62243 · CVE-2026-66257 · CVE-2026-66273 · CVE-2026-66274 · CVE-2026-67593 · CVE-2026-68494

RHSA-2026:56338: Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update

CVE-2026-9595 · CVE-2026-12143 · CVE-2026-14257 · CVE-2026-44705 · CVE-2026-45623 · CVE-2026-46625 · CVE-2026-54272 · CVE-2026-69152 · CVE-2026-69153 · CVE-2026-69192 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089

RHSA-2026:66488: Red Hat Security Advisory: Red Hat AMQ Broker 7.14.1 release and security update

CVE-2025-14813 · CVE-2026-0636 · CVE-2026-5588 · CVE-2026-9595 · CVE-2026-10050 · CVE-2026-10051 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-34478 · CVE-2026-34480 · CVE-2026-34481 · CVE-2026-40983 · CVE-2026-40984 · CVE-2026-42198 · CVE-2026-42264 · CVE-2026-42338 · CVE-2026-42578 · CVE-2026-42581 · CVE-2026-42583 · CVE-2026-42584 · CVE-2026-42587 · CVE-2026-42588 · CVE-2026-44248 · CVE-2026-44249 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44496 · CVE-2026-44893 · CVE-2026-45205 · CVE-2026-45416 · CVE-2026-45736 · CVE-2026-48043 · CVE-2026-48059 · CVE-2026-48779 · CVE-2026-49362 · CVE-2026-49363 · CVE-2026-49364 · CVE-2026-49432 · CVE-2026-49978 · CVE-2026-50010 · CVE-2026-50734 · CVE-2026-53916 · CVE-2026-54512 · CVE-2026-54513 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-55851 · CVE-2026-56745 · CVE-2026-56746 · CVE-2026-56819 · CVE-2026-57822 · CVE-2026-57967 · CVE-2026-59869 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59899 · CVE-2026-62243 · CVE-2026-66257 · CVE-2026-66273 · CVE-2026-66274 · CVE-2026-67593 · CVE-2026-68494

RHSA-2026:56357: Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update

CVE-2026-9595 · CVE-2026-14257 · CVE-2026-45623 · CVE-2026-46625 · CVE-2026-54272 · CVE-2026-69152 · CVE-2026-69153 · CVE-2026-69192 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089

RHSA-2026:54760: Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage

CVE-2025-4330 · CVE-2026-6477 · CVE-2026-8643 · CVE-2026-9595 · CVE-2026-11940 · CVE-2026-13676 · CVE-2026-13757 · CVE-2026-14164 · CVE-2026-14257 · CVE-2026-34993 · CVE-2026-41989 · CVE-2026-69152 · CVE-2026-69153 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089

RHSA-2026:59155: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

CVE-2025-62718 · CVE-2025-69223 · CVE-2025-69227 · CVE-2025-69228 · CVE-2026-1615 · CVE-2026-9595 · CVE-2026-12143 · CVE-2026-14257 · CVE-2026-15307 · CVE-2026-44545 · CVE-2026-44705 · CVE-2026-59886 · CVE-2026-67325 · CVE-2026-69152 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-71364 · CVE-2026-71365 · CVE-2026-71366

RHSA-2026:34794: Red Hat Security Advisory: OpenShift Container Platform 4.22.4 bug fix and security update

CVE-2026-9595 · CVE-2026-33186 · CVE-2026-34986 · CVE-2026-35469 · CVE-2026-42154 · CVE-2026-44494

RHSA-2026:51038: Red Hat Security Advisory: OpenShift Container Platform 4.22.9 bug fix and security update

CVE-2026-9595 · CVE-2026-27136 · CVE-2026-39828 · CVE-2026-39835 · CVE-2026-43003 · CVE-2026-44918 · CVE-2026-46597 · CVE-2026-48801 · CVE-2026-49332

RHSA-2026:59153: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update

CVE-2026-9595 · CVE-2026-12143 · CVE-2026-15307 · CVE-2026-27459 · CVE-2026-39363 · CVE-2026-44244 · CVE-2026-44545 · CVE-2026-44705 · CVE-2026-46625 · CVE-2026-59886 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-71364 · CVE-2026-71365 · CVE-2026-71366

RHSA-2026:37186: Red Hat Security Advisory: OpenShift Container Platform 4.21.24 bug fix and security update

CVE-2026-4800 · CVE-2026-6322 · CVE-2026-9595 · CVE-2026-13676 · CVE-2026-44293

Source published: Jun 15, 2026, 3:00:21 PM (timezone not stated)
Source modified: Jun 15, 2026, 4:08:35 PM (timezone not stated)
Saved here: 13 Nov 2026 18:06:53 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

nvd · CVE-2026-9595

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-346 · CWE-441

Original publisher date fields

published: 2026-06-15T16:16:35.227

lastModified: 2026-06-17T11:05:31.643

1 source CPE criteria · context only

cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 15 Jun 2026 16:16:35 UTC
Source modified: 17 Jun 2026 11:05:31 UTC
Saved here: 25 Oct 2026 16:19:28 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 3.1 · [email protected] · Primary · 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

osv · GHSA-mx8g-39q3-5c79

Published

### Impact When a user-configured proxy on `webpack-dev-server` has a broad context (e.g. `/`) and `ws: true`, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and `Origin` header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket). ### Patches Fixed in `webpack-dev-server` 5.2.5. ### Workarounds Scope user-defined proxy `context` to specific paths instead of `/`, or omit `ws: true` from the proxy entry when WebSocket forwarding is not required.

Source published: 17 Jun 2026 18:13:31 UTC
Source modified: 10 Sep 2026 03:51:09 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Publisher rating · MODERATE