CVE-2026-48779

ws: Memory exhaustion DoS from tiny fragments and data chunks

Published Jun 16, 2026 CVSS 3.1 · 7.5 High EPSS 1.4% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-96hv-2xvq-fx4p ws: Memory exhaustion DoS from tiny fragments and data chunks
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/errata/RHSA-2026:57013 cve-icon
https://access.redhat.com/errata/RHSA-2026:57590 cve-icon
https://access.redhat.com/errata/RHSA-2026:60520 cve-icon
https://access.redhat.com/errata/RHSA-2026:65126 cve-icon
https://access.redhat.com/errata/RHSA-2026:66488 cve-icon
https://access.redhat.com/errata/RHSA-2026:66545 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
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Websockets
Websockets ws
Vendors & Products Websockets
Websockets ws
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Sep 11, 2026, 12:09 PM
Reserved
May 22, 2026, 8:18 PM
Status
Modified
Published
Jun 17, 2026, 1:20 PM
Modified
Oct 26, 2026, 12:10 PM
Severity
Important
Public date
Jun 16, 2026, 9:26 PM