Undici WebSocket 64bit len overflow (<=6.23.0, <=7.23.0)
CVE-2026-1528 Published on March 12, 2026

undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Github Repository NVD

Vulnerability Analysis

CVE-2026-1528 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Types

Uncaught Exception

An exception is thrown from a function, but it is not caught. When an exception is not caught, it may cause the program to crash or expose sensitive information.

Improper Validation of Specified Quantity in Input

The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.


Products Associated with CVE-2026-1528

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Red Hat Cryostat
 
Red Hat Enterprise Linux Eus
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Rhel Eus
 
Red Hat Rhdh
 
Red Hat Openshift Ai
 
Red Hat Openshift Devspaces
 
Red Hat Openshift Pipelines
 
Red Hat Openshift Lightspeed
 
Red Hat Ansible Portal
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Jbosseapxp
 
Red Hat Cluster Observability Operator
 

Affected Versions

undici: Red Hat Cryostat 4 on RHEL 9: Red Hat Cryostat 4 on RHEL 9: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10.0 Extended Update Support: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.6 Extended Update Support: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Cluster Observability Operator 1.5.0: Red Hat Developer Hub 1.8: Red Hat Developer Hub 1.9: Red Hat OpenShift AI 2.16: Red Hat OpenShift Dev Spaces 3.28: Red Hat OpenShift Pipelines 1.2: Red Hat OpenShift Lightspeed: Red Hat OpenShift Lightspeed: Red Hat OpenShift Pipelines: Red Hat Developer Hub: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift Dev Spaces: Red Hat OpenShift Dev Spaces: Red Hat Self-service automation portal 2:

Vulnerable Packages

The following package name and versions may be associated with CVE-2026-1528

Package Manager Vulnerable Package Versions Fixed In
npm undici >= 7.0.0, < 7.24.0 7.24.0
npm undici >= 6.0.0, < 6.24.0 6.24.0

Exploit Probability

EPSS
0.34%
Percentile
25.84%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.