Vulnerability-Lookup

CVE-2026-14631 (GCVE-0-2026-14631)

Vulnerability from cvelistv5 – Published: 2026-07-03 17:23 – Updated: 2026-07-06 15:54

Title

webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header

Summary

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.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-06 15:54 UTC

CWE

CWE-20 - Improper Input Validation
CWE-248 - Uncaught Exception

Assigner

openjs redhat root

References

2 references

URL	Tags
https://github.com/webpack/webpack-dev-server/sec…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version	CPE status
webpack-dev-server	webpack-dev-server	Affected: 0 , < 5.2.6 (semver) Unaffected: 5.2.6 (semver)	guessed

Credits

Str1ckl4nd bjohansebas UlisesGascon

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-14631

Vulnerability from fkie_nvd - Published: 2026-07-03 18:16 - Updated: 2026-07-07 15:08

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	ce714d77-add3-4f53-aff5-83d477b104bb	https://cna.openjsf.org/security-advisories.html	Third Party Advisory
	ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-m28w-2pqf-7qgj	Mitigation, Vendor Advisory, Patch

Impacted products

	Vendor	Product	Version
	webpack.js	webpack-dev-server	*

JSON

To clipboard

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GHSA-M28W-2PQF-7QGJ

Vulnerability from github – Published: 2026-07-20 22:02 – Updated: 2026-07-20 22:02

Summary

webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header

Details

Impact

An unauthenticated peer that can reach the webpack-dev-server process can terminate it by sending 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 header triggers an uncaught exception in the host-validation path and crashes the dev server process.

Patches

Fixed in webpack-dev-server 5.2.6 by treating malformed Host and Origin header values as invalid rather than throwing (see PR #5699).

Workarounds

Keep the dev server bound to localhost (the default) and do not expose it to untrusted networks.

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

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    "nvd_published_at": "2026-07-03T18:16:24Z",
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  },
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  "modified": "2026-07-20T22:02:31Z",
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    {
      "type": "PACKAGE",
      "url": "https://github.com/webpack/webpack-dev-server"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-14631 (GCVE-0-2026-14631)

FKIE_CVE-2026-14631

GHSA-M28W-2PQF-7QGJ

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour