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CVE-2026-48779

7.5 · HIGH

ws is an open source WebSocket client and server for Node.js.

Published Jun 17, 2026CWE-400EPSS 0.93%

Overview

CVE-2026-48779 is a high-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7GitHubgithub.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53GitHubgithub.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94GitHubgithub.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8GitHubgithub.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4pRefaccess.redhat.com/errata/RHSA-2026:29197Refaccess.redhat.com/errata/RHSA-2026:33155Refaccess.redhat.com/errata/RHSA-2026:33160Refaccess.redhat.com/errata/RHSA-2026:33163Refaccess.redhat.com/errata/RHSA-2026:33173

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48779?

CVE-2026-48779 is a high-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-48779?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-48779?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-48779?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48779 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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