Description
A flaw was found in glib-networking. When establishing connections using Transport Layer Security (TLS) version 1.3, the client-side session cache does not limit the number of session tickets retained for a single host. A malicious server can exploit this by sending excessive session ticket messages, causing the client application to continuously consume memory. This unbounded memory growth can exhaust system memory, resulting in a Denial of Service (DoS).
Published: 2026-10-30
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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History

Fri, 30 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 30 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Red Hat
Red Hat enterprise Linux
Vendors & Products Red Hat
Red Hat enterprise Linux

Fri, 30 Oct 2026 04:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in glib-networking. When establishing connections using Transport Layer Security (TLS) version 1.3, the client-side session cache does not limit the number of session tickets retained for a single host. A malicious server can exploit this by sending excessive session ticket messages, causing the client application to continuously consume memory. This unbounded memory growth can exhaust system memory, resulting in a Denial of Service (DoS).
Title Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows remote denial of service
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-400
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Red Hat Enterprise Linux
Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-30T04:08:40.002Z

Reserved: 2026-10-01T15:30:36.833Z

Link: CVE-2026-103963

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-30T05:16:57.237

Modified: 2026-10-30T05:16:57.780

Link: CVE-2026-103963

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-29T08:06:30Z

Links: CVE-2026-103963 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T08:00:13Z

Weaknesses