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CVE-2026-9595

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

CVSS 3.1 5.3 MEDIUMEUVD CVSS 3.1 5.3 CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary 5.3 MEDIUMCVSS 3.1 · [email protected] · Primary 4.3 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by webpack-dev-server 5.2.5KEV status unknown
Original advisory

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.

Read the publisher's advisory

euvd · EUVD-2026-36729

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.

Read the publisher's advisory

nvd · 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.

Read the publisher's advisory

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-9595

Published

webpack-dev-server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "webpack-dev-server",
                    "product": "webpack-dev-server",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "0",
                            "lessThan": "5.2.5"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "5.2.5"
                        }
                    ],
                    "packageURL": "pkg:npm/webpack-dev-server"
                }

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

euvd · EUVD-2026-36729

Published

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

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

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

nvd · CVE-2026-9595

Published

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.

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

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

osv · GHSA-mx8g-39q3-5c79

Published

webpack-dev-server

npm

SEMVER · introduced 0 → fixed 5.2.5

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

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 14:48 UTC · 256 of 275 readable · 252 fully read · documentation 469/469 current

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