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Fencer Intel
high 7.5

CVE-2026-103963 json

Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows remote denial of service

published 10d ago modified 5d ago also EUVD-2026-113706

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

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 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).

Patch / fix

  • glib-networking openSUSE Tumbleweed 2.90.1-1.1

opensuse advisories openSUSE-SU-2026:12363-1

  • glib-networking Azure Linux 3.0 2.78.0-3

azure linux advisories AZL-112445

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-103963 updated cvss 7.5

glib-networking: Unbounded TLS 1.3 session ticket queue growth in glib-networking allows remote denial of service

  • Red Hat Enterprise Linux 9 glib-networking Red Hat Enterprise Linux 10 glib-networking
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 6 glib-networking Red Hat Enterprise Linux 7 glib-networking, glib-networking-tests Red Hat Enterprise Linux 8 glib-networking
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6d ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.