---
id: CVE-2026-103963
title: >-
  Glib-networking: unbounded tls 1.3 session ticket queue growth in
  glib-networking allows remote denial of service
summary: >-
  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 serve…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: Red Hat
product: glib-networking
affected:
  - glib-networking (all versions)
  - glib-networking
  - glib-networking
  - glib-networking
  - glib-networking (all versions)
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T04:08:40.002Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103963'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-103963'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2465656'
    label: RHBZ#2465656
  - url: 'https://gitlab.gnome.org/GNOME/glib-networking/-/merge_requests/288'
tags:
  - cve.org
epss: 0.00339
epssPercentile: 0.27473
ingestedAt: '2026-11-03T10:42:03.628Z'
---

## Overview

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).

## Affected

- `glib-networking (all versions)`
- `glib-networking`
- `glib-networking`
- `glib-networking`
- `glib-networking (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

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.