Secuno
ENNL
Book demo

CVE-2026-48779

Ws denial of service

7.5 HIGHPublic exploitEPSS 0.93%
  1. Published17 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Ws≥ 1.1.0 < 5.2.5 · ≥ 6.0.0 < 6.2.4 · ≥ 7.0.0 < 7.5.11 · ≥ 8.0.0 < 8.21.0

Remediation

Fixed in
Ws≥ 5.2.5

References

and 22 more references

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1031028.6
Pexip Infinity before 41.0 is affected by improper input validation in the signaling…
CVE-2026-1031018.6
Pexip Infinity 30.0 through 40.x before 41.0 is affected by improper input validation…
CVE-2026-904418.1
A missing authorization vulnerability in the wgagent management daemon's session…
CVE-2026-866088.2
The WP Recipe Maker WordPress plugin before 10.8.2 does not have any authorisation…
CVE-2026-143218.2
The divi-dash WordPress plugin before 1.0.7 does not validate the source of the client…
CVE-2026-336258.8
LMDeploy is a toolkit for compressing, deploying, and serving large language models.…

Frequently asked

Is CVE-2026-48779 being actively exploited?

CVE-2026-48779 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.93%.

How severe is CVE-2026-48779?

CVE-2026-48779 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.93% probability of exploitation.

Which products are affected by CVE-2026-48779?

Affected products include Ws.

How do I fix CVE-2026-48779?

Upgrade affected software to a fixed version, for example Ws 5.2.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-48779 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.