CVE WatchSep 11, 2026

CVE-2026-48779

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.

CVSS

7.5

High

EPSS

0.9%

p60

KEV

—

Exploit Today

0-100

Published: Jun 17, 2026 · Last modified: Sep 11, 2026 · CWE-400 · CWE-770 · CWE-1050

EPSS · 30d

0.8%EPSS · 30 days0.9%

2026-09-222026-10-20

Technical 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.

Official references

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