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.
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:29197 cve-icon
https://access.redhat.com/errata/RHSA-2026:33155 cve-icon
https://access.redhat.com/errata/RHSA-2026:33160 cve-icon
https://access.redhat.com/errata/RHSA-2026:33163 cve-icon
https://access.redhat.com/errata/RHSA-2026:33173 cve-icon
https://access.redhat.com/errata/RHSA-2026:33183 cve-icon
https://access.redhat.com/errata/RHSA-2026:33574 cve-icon
https://access.redhat.com/errata/RHSA-2026:34342 cve-icon
https://access.redhat.com/errata/RHSA-2026:36754 cve-icon
https://access.redhat.com/errata/RHSA-2026:36820 cve-icon
https://access.redhat.com/errata/RHSA-2026:37272 cve-icon
https://access.redhat.com/errata/RHSA-2026:40984 cve-icon
https://access.redhat.com/errata/RHSA-2026:41928 cve-icon
https://access.redhat.com/errata/RHSA-2026:41941 cve-icon
https://access.redhat.com/errata/RHSA-2026:41944 cve-icon
https://access.redhat.com/errata/RHSA-2026:48151 cve-icon
https://access.redhat.com/errata/RHSA-2026:56366 cve-icon
https://access.redhat.com/errata/RHSA-2026:56431 cve-icon
https://access.redhat.com/security/cve/CVE-2026-48779 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2489661 cve-icon
https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7 cve-icon cve-icon cve-icon
https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53 cve-icon cve-icon cve-icon
https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94 cve-icon cve-icon cve-icon
https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8 cve-icon cve-icon cve-icon
https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p cve-icon cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-48779 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48779.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-48779 cve-icon
History

Wed, 19 Aug 2026 12:30:00 +0000


Wed, 24 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1050
References
Metrics threat_severity

None

threat_severity

Important


Thu, 18 Jun 2026 04:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-19T12:05:01.269Z

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

Link: CVE-2026-48779

cve-icon Vulnrichment

Updated: 2026-08-19T12:05:01.269Z

cve-icon NVD

Status : Modified

Published: 2026-06-17T13:20:42.887

Modified: 2026-08-19T12:18:27.840

Link: CVE-2026-48779

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-16T21:26:22Z

Links: CVE-2026-48779 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-24T10:45:03Z