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CVE-2026-48779

HIGH 7.5 PoC AVAILABLE

Published 2026-06-16 · Last modified 2026-07-21

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.8%chance of exploitation in 30 days · 52nd percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-48779/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-48779/poc.json

Affected

Vendors Websockets Red Hat Ws Project

Products Ws Cluster Observability Operator 1.5.0 Red Hat Developer Hub 1.10 Red Hat Developer Hub 1.9 Red Hat Discovery 2 Red Hat Migration Toolkit 1.8 Red Hat Openshift Data Foundation 4.18 Red Hat Openshift Data Foundation 4.19 Red Hat Openshift Data Foundation 4.2 Red Hat Openshift Dev Spaces 3.29 Red Hat Openshift Service Mesh 2.6 Red Hat Openshift Service Mesh 3.0

Weakness (CWE)

  • CWE-400: : Uncontrolled Resource Consumption
  • CWE-770: : Allocation of Resources Without Limits or Throttling
  • CWE-1050: Excessive Platform Resource Consumption within a Loop

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Known Affected Software Configurations

VendorProductVersion range
Ws ProjectWs≥ 1.1.0 and < 5.2.5
Ws ProjectWs≥ 6.0.0 and < 6.2.4
Ws ProjectWs≥ 7.0.0 and < 7.5.11
Ws ProjectWs≥ 8.0.0 and < 8.21.0

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · ADP Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Exploits & PoC

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS