← CVE Intelligence

CVE-2026-48779

ws: Memory exhaustion DoS from tiny fragments and data chunks PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
websockets / wsaffected >= 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

CWE

CWE-400, CWE-770

References

ADP enrichment

CISA-ADP

No English description supplied.

redhat-SADP

A flaw was found in ws, an open source WebSocket client and server. A remote attacker can exploit this memory exhaustion vulnerability by sending a high volume of exceptionally small fragments and data chunks. This action forces the affected component to allocate and hold structural wrappers that consume excessive memory. Consequently, this leads to process termination and a denial of service (DoS) for the remote peer.