GLib GDBus gdbusauth DoS via Input Length Misvalidation
CVE-2026-15588 Published on July 20, 2026

Gdbusserver: glib2: gdbusserver pre-authentication dos via unbounded sasl line buffering
A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang.

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Vulnerability Analysis

CVE-2026-15588 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-15588. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.

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

Timeline

Reported to Red Hat.

Made public.

Weakness Type

Allocation of Resources Without Limits or Throttling

The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.


Products Associated with CVE-2026-15588

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Red Hat Enterprise Linux (RHEL)
 
Red Hat Hummingbird
 
Red Hat Openshift
 
Red Hat Rhui
 
Red Hat Discovery
 
Red Hat Cert Manager
 
Red Hat Rhel Aus
 
Red Hat Rhel Eus Long Life
 
Red Hat Rhel Els
 
Red Hat Rhel E4s
 
Red Hat Enterprise Linux Eus
 
Red Hat Rhel Tus
 
Red Hat Rhel Eus
 
Red Hat Ai Inference Server
 
Red Hat Openshift Ai
 

Affected Versions

Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10.0 Extended Update Support: Red Hat Enterprise Linux 7 Extended Lifecycle Support: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: Red Hat Enterprise Linux 8.8 Telecommunications Update Service: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: Red Hat Enterprise Linux 9.6 Extended Update Support: Cert Manager support for Red Hat OpenShift release 1.17: Cert Manager support for Red Hat OpenShift release 1.17: Cert Manager support for Red Hat OpenShift release 1.17: Cert Manager support for Red Hat OpenShift release 1.17: Cert Manager support for Red Hat OpenShift release 1.17: Cert Manager support for Red Hat OpenShift release 1.18: Cert Manager support for Red Hat OpenShift release 1.18: Cert Manager support for Red Hat OpenShift release 1.18: Cert Manager support for Red Hat OpenShift release 1.18: Cert Manager support for Red Hat OpenShift release 1.18: Cert Manager support for Red Hat OpenShift release 1.19: Cert Manager support for Red Hat OpenShift release 1.19: Cert Manager support for Red Hat OpenShift release 1.19: Cert Manager support for Red Hat OpenShift release 1.19: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Cert Manager support for Red Hat OpenShift release 1.20: Red Hat AI Inference Server 3.2: Red Hat AI Inference Server 3.2: Red Hat AI Inference Server 3.2: Red Hat AI Inference Server 3.5: Red Hat AI Inference Server 3.5: Red Hat AI Inference Server 3.5: Red Hat AI Inference Server 3.5: Red Hat AI Inference Server 3.5: Red Hat AI Inference Server 3.5: Red Hat Discovery 2: Red Hat Discovery 2: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat OpenShift AI 3.0: Red Hat OpenShift AI 3.0: Red Hat OpenShift AI 3.0: Red Hat OpenShift AI 3.0: Red Hat OpenShift AI 3.0: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.2: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.4: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat OpenShift AI 3.5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Update Infrastructure 5: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4:

Exploit Probability

EPSS
0.48%
Percentile
38.89%

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.