CVE-2026-15588: Gdbusserver: glib2: gdbusserver pre-authentication dos via unbounded sasl line buffering

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-20 · updated 2026-10-30
Weakness: CWE-770

Description

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.

Affected products

Red Hat Cert Manager support for Red Hat OpenShift release 1.17: all versions — fixed in 1791371080
Red Hat Cert Manager support for Red Hat OpenShift release 1.18: all versions — fixed in 1791459707
Red Hat Cert Manager support for Red Hat OpenShift release 1.19: all versions — fixed in 1788348522
Red Hat Cert Manager support for Red Hat OpenShift release 1.20: all versions — fixed in 1790223279
Red Hat OpenShift Container Platform 4.18: all versions
Red Hat AI Inference Server 3.2: all versions — fixed in 1790621714
Red Hat AI Inference Server 3.5: all versions — fixed in 1791425869
Red Hat Discovery 2: all versions — fixed in 1788205779
Red Hat Enterprise Linux 10: all versions — fixed in 0:2.80.4-12.el10_2.21
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:2.80.4-4.el10_0.17
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:2.56.1-13.el7_9.1
Red Hat Enterprise Linux 8: all versions — fixed in 0:2.56.4-177.el8_10
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:2.56.4-10.el8_4.7
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:2.56.4-10.el8_4.7
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:2.56.4-158.el8_6.7
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On: all versions — fixed in 0:2.56.4-158.el8_6.7
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:2.56.4-165.el8_8.2
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:2.56.4-165.el8_8.2
Red Hat Enterprise Linux 9: all versions — fixed in 0:2.68.4-19.el9_8.9
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:2.68.4-7.el9_2.7
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions: all versions — fixed in 0:2.68.4-14.el9_4.8
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:2.68.4-16.el9_6.7
Red Hat Enterprise Linux AI 3.5: all versions — fixed in 1793206758
Red Hat Hardened Images: all versions — fixed in 2.89.1-1.1.hum1
Red Hat OpenShift AI 3.0: all versions — fixed in 1790276886
Red Hat OpenShift AI 3.2: all versions — fixed in 1790703497
Red Hat OpenShift AI 3.4: all versions — fixed in 1790703542
Red Hat OpenShift AI 3.5: all versions — fixed in 1790703552
Red Hat OpenShift Container Platform 5: all versions
Red Hat Update Infrastructure 5: all versions — fixed in 1787241211

How to fix

Upgrade to a fixed version: Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371080; Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459707; Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348522; Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790223279; Red Hat AI Inference Server 3.2 1790621714; Red Hat AI Inference Server 3.5 1791425869; Red Hat Discovery 2 1788205779; Red Hat Enterprise Linux 10 0:2.80.4-12.el10_2.21; Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.80.4-4.el10_0.17; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.56.1-13.el7_9.1; Red Hat Enterprise Linux 8 0:2.56.4-177.el8_10; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.56.4-10.el8_4.7. Check the vendor advisory for mitigations.

References

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