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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-serve
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3e30828eef8b83c57718e5e06bd2a015f7307c83ea1165ba0d506f70736a3a34
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/webpack-dev-server","product":"webpack-dev-server","vendor":"webpack-dev-server","versions":[{"lessThan":"5.2.6","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"5.2.6","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/references/1
{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8d6d2d8b271c67244707c04625fde75544e0295585292f8cb0b96f97589b7301 · sha256:dfc57cd6267cb5d6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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