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Review reviewHigh

CVE-2026-48779

websockets ws, Cryostat 4 on RHEL 9, Cluster Observability Operator 1.5.0

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,...

CVSS
7.5
EPSS
0.78%
52.4% percentile
CISA KEV
Not listed
Published
2026.06.17
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.78%
Technical severityCVSS 7.5

Vulnerability overview

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,...

Affected product and versions

Product
websockets ws, Cryostat 4 on RHEL 9, Cluster Observability Operator 1.5.0
Affected versions
>= >= 1.1.0, < 5.2.5, >= >= 6.0.0, < 6.2.4, >= >= 7.0.0, < 7.5.11, >= >= 8.0.0, < 8.21.0, >= 1.1.0 < 5.2.5, >= 6.0.0 < 6.2.4, >= 7.0.0 < 7.5.11, >= 8.0.0 < 8.21.0
Fixed versions
5.2.5, 6.2.4, 7.5.11, 8.21.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that websockets ws, Cryostat 4 on RHEL 9, Cluster Observability Operator 1.5.0 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-1050, CWE-400, CWE-770