ws: Memory exhaustion DoS from tiny fragments and data chunks

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Summary

CVECVE-2026-48779
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-17 13:20:42 UTC
Updated2026-06-17 16:26:14 UTC
Descriptionws 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Websockets Ws affected >= 1.1.0, < 5.2.5 Not specified
CNA Websockets Ws affected >= 6.0.0, < 6.2.4 Not specified
CNA Websockets Ws affected >= 7.0.0, < 7.5.11 Not specified
CNA Websockets Ws affected >= 8.0.0, < 8.21.0 Not specified

References

ReferenceSourceLinkTags
github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p [email protected] github.com
github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7 [email protected] github.com
github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94 [email protected] github.com
github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53 [email protected] github.com
github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8 [email protected] github.com
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