Resource exhaustion in Serialize-javascript - CVE-2026-34043

Vulnerability identifier: #VU128353

CSH Severity: Medium

CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-34043

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 serialize() function when serializing a specially crafted array-like object. A remote attacker can supply a crafted array-like object to cause a denial of service.

Exploitation can cause 100% CPU usage and the process may hang indefinitely.

Serialize-javascript
IBM Fusion HCI
Confluence Data Center
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
dotnet8.0 (Red Hat package)
Data Cataloging
Red Hat OpenShift Container Platform

Install security update from vendor's website.

Serialize-javascript - update to 7.0.5
IBM Fusion HCI - update to 2.13.0
Confluence Data Center - addressed in versions 9.2.21, 10.2.14
Data Cataloging - update to 2.5.3
Red Hat OpenShift Container Platform - addressed in versions 4.16.65, 4.17.55
dotnet8.0 (Red Hat package) - addressed in versions 8.0.127-1.el8_10, 8.0.127-1.el9_4, 8.0.127-1.el9_8, 8.0.127-1.el10_0, 8.0.127-1.el10_2

• https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v

• Resource exhaustion in Serialize-javascript
• Red Hat Enterprise Linux 10 update for .NET 8.0
• Red Hat Enterprise Linux 8 update for .NET 8.0
• Red Hat Enterprise Linux 9 update for .NET 8.0
• Red Hat Enterprise Linux 10 update for .NET 8.0
• Red Hat Enterprise Linux 9 update for .NET 8.0
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.16
• IBM Fusion, IBM Fusion HCI and IBM Fusion Data Cataloging update for serialize-javascript
• Multiple vulnerabilities in Confluence Data Center
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.17