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CVE-2026-48779

ws: Memory exhaustion DoS from tiny fragments and data chunks

Published: Jun 16, 2026Updated: Jun 18, 2026 Sources: CVE List NVDCWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.7%
Top 53.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400CWE-770

Affected Products

wswebsockets
Mixed
Web & CMS Plugins / cms-core
wsws project
Library
OSS Libraries / npm
websocketscommercialWeb & CMS Pluginsaka websockets
ws projectpackage-ecosystemOSS Librariesaka ws

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p
github.com
https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7
github.com
https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53
github.com
and 2 more references View all →

Timeline

Published
Jun 16, 2026
Last Updated
Jun 18, 2026

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