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No exploitation reportedFix available

CVE-2026-14631

No exploitation reported by the sources we read.

  • Published2026-07-03
  • Fixed in5.2.6
  • WeaknessCWE-20 · CWE-248

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malformed Host header or a WebSocket upgrade to the default /ws endpoint with a malformed Origin header. The malformed value causes an uncaught exception in the host-validation path and crashes the dev server. Impact is limited to availability of the development server, no data disclosure, no code execution. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: keep the dev server bound to localhost (the default) and do not expose it to untrusted networks.

Timeline

dates in UTC
  1. 2026-07-0318:16CVE publishedNVD

Versions per branch

NVD · OSV
Webpack.js webpack-dev-server
BranchAffectedFixed in
5.2< 5.2.65.2.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As openjs, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • webpack-dev-serverother versions: not affected
    Affected
    • < 5.2.6fixed in 5.2.6semver

    Not affected = 5.2.6

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.2-root.io.3
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 3.11.3-root.io.4
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.0.4-root.io.2
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.3-root.io.3
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.4-root.io.2
  • arangodb-3.11Chainguardall versions · fixed in 3.11.14.5-r25
  • arangodb-3.12Chainguardall versions · fixed in 3.12.11-r0
  • argo-workflowsCleanStartall versions · fixed in 3.6.19-r6

31 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-14631 Red Hat Product Security

    webpack-dev-server: webpack-dev-server: Denial of Service via malformed headers

Full record on NVD

Fix

  1. Update Webpack.js webpack-dev-server to 5.2.6

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-07-06
  • CNACVSS 3.15.3known since 2026-10-23
  • CNAweakness (CWE)CWE-20, CWE-248known since 2026-10-23
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-07-20

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2026-07-03
Last Modified
2026-07-07
NVD status
Analyzed
GitHub Advisory
GHSA-m28w-2pqf-7qgj

Frequently asked questions

What is CVE-2026-14631?

webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer sends either a normal HTTP request with a malformed Host header or a WebSocket upgrade to the default /ws endpoint with a malformed Origin header. The malformed value causes an uncaught exception in the host-validation path and crashes the dev server. Impact is limited to availability of the development server, no data disclosure, no code execution. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: keep the dev server bound to localhost (the default) and do not expose it to untrusted networks.

Is CVE-2026-14631 actively exploited?

Active exploitation of CVE-2026-14631 has not been confirmed. Its EPSS score was 0.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-14631?

CVE-2026-14631 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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