Resource exhaustion in ws - CVE-2026-48779

Vulnerability identifier: #VU132291

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48779

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the WebSocket message handling logic when processing a high volume of exceptionally small fragments and data chunks. A remote attacker can send a large number of tiny fragmented messages to cause a denial of service.

The issue can lead to process termination due to out-of-memory conditions.

ws
Netezza Appliance
Confluence Data Center
Bitbucket Data Center
Fedora
python-jupytext
OpenShift Data Foundation (formerly OpenShift Container Storage)

Install security update from vendor's website.

ws - addressed in versions 5.2.5, 6.2.4, 7.5.11, 8.21.0
Netezza Appliance - update to 1.0.2.0
Confluence Data Center - update to 9.2.5
Bitbucket Data Center - addressed in versions 9.4.23, 10.2.6, 10.4.2
python-jupytext - addressed in versions 1.19.4-1.fc43, 1.19.4-1.fc44
OpenShift Data Foundation (formerly OpenShift Container Storage) - addressed in versions 4.18.25, 4.19.20

• https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p
• https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94

• Resource exhaustion in ws
• Fedora 44 update for python-jupytext
• Fedora 43 update for python-jupytext
• Multiple vulnerabilities in OpenShift Data Foundation (formerly OpenShift Container Storage) 4.18
• Multiple vulnerabilities in OpenShift Data Foundation (formerly OpenShift Container Storage) 4.19
• Resource exhaustion in Confluence Data Center
• IBM Netezza Appliance update for ws
• Multiple vulnerabilities in Bitbucket Data Center