ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
websockets ws affected
Version Status Constraints
>= 1.1.0, < 5.2.5 affected —
>= 6.0.0, < 6.2.4 affected —
>= 7.0.0, < 7.5.11 affected —
>= 8.0.0, < 8.21.0 affected —

No data.

No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-96hv-2xvq-fx4p ws: Memory exhaustion DoS from tiny fragments and data chunks
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7 cve-icon
https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53 cve-icon
https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94 cve-icon
https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8 cve-icon
https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p cve-icon
History

Wed, 17 Jun 2026 05:15:00 +0000

Type Values Removed Values Added
First Time appeared Websockets
Websockets ws
Vendors & Products Websockets
Websockets ws

Tue, 16 Jun 2026 22:00:00 +0000

Type Values Removed Values Added
Description ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.
Title ws: Memory exhaustion DoS from tiny fragments and data chunks
Weaknesses CWE-400
CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-16T21:26:22.537Z

Reserved: 2026-05-22T20:18:20.365Z

Link: CVE-2026-48779

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-17T01:30:04Z

Weaknesses