How severe is CVE-2026-48779?

CVE-2026-48779 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-48779 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-48779?

CVE-2026-48779 affects Ws Project Ws. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-48779?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-48779 have an EU (EUVD) identifier?

Yes. CVE-2026-48779 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37504.

When was CVE-2026-48779 published?

CVE-2026-48779 was published on 2026-06-17 and last updated on 2026-07-07.

CVE-2026-48779

CVE-2026-48779 is a high-severity vulnerability in Ws Project Ws with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37504
Weakness: CWE-400
Affected product: Ws Project Ws
Published: 2026-06-17
Last modified: 2026-07-07

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.

Frequently asked questions

What is 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 6.2.4, 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.
How severe is CVE-2026-48779?: CVE-2026-48779 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-48779 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-48779?: CVE-2026-48779 affects Ws Project Ws. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-48779?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-48779 have an EU (EUVD) identifier?: Yes. CVE-2026-48779 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37504.
When was CVE-2026-48779 published?: CVE-2026-48779 was published on 2026-06-17 and last updated on 2026-07-07.

References

Affected products (1)

cpe:2.3:a:ws_project:ws:*:*:*:*:*:node.js:*:*

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