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CVE-2026-103963

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

7.5 HighFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.34%Unchanged since Oct 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

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

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).

Record
CVE-2026-103963
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-04
EUVDEUVD-2026-113706 7.5

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).

Record
EUVD-2026-113706
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-04
GitHub AdvisoriesGHSA-xwh2-f88c-v27r 7.5

A flaw was found in glib-networking. When establishing connections using Transport Layer Security...

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).

Record
GHSA-xwh2-f88c-v27r
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
NVD 7.5

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).

Record
CVE-2026-103963
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-04
OSVDEBIAN-CVE-2026-103963 7.5

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).

Record
DEBIAN-CVE-2026-103963
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
OSVUBUNTU-CVE-2026-103963 7.5

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).

Record
UBUNTU-CVE-2026-103963
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-05
OSVAZL-112445 No score

CVE-2026-103963 affecting package glib-networking for versions less than 2.78.0-3

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).

Record
AZL-112445
Updated
2026-11-06
OSVopenSUSE-SU-2026:12363-1 No score

glib-networking-2.90.1-1.1 on GA media

These are all security issues fixed in the glib-networking-2.90.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12363-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
glib-networking
Azure Linux:3
 before 2.78.0-3
2.78.0-3
glib-networking
Debian:12
 All versions, plus listed versions
2.74.0-42.76.0-12.76.1-12.76.1-22.76~beta-1
Show 8 moreShow less
2.78.0-12.80.0-12.80.1-12.80~alpha-12.80~alpha-22.80~rc-12.90.0-12.90.0-2
 None known
glib-networking
Debian:13
 All versions, plus listed versions
2.80.1-12.90.0-12.90.0-2
 None known
glib-networking
Debian:14
 All versions, plus listed versions
2.80.1-12.90.0-12.90.0-2
 None known
glib-networking
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.46.0-12.46.1-12.46.1-1build12.48.0-12.48.2-1~ubuntu16.04.12.48.2-1~ubuntu16.04.2
 None known
glib-networking
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.54.0-12.54.1-12.54.1-22.55.90-12.56.0-12.56.0-1ubuntu0.1
 None known
glib-networking
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.62.1-12.63.2-12.63.3-0build12.63.90-1ubuntu12.63.91-1ubuntu1
Show 4 moreShow less
2.64.0-12.64.1-12.64.2-1build12.64.2-1ubuntu0.1
 None known
glib-networking
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.68.2-22.70.0-12.70.1-12.72~alpha-12.72~beta-1build12.72.0-1
 None known
glib-networking
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.78.0-12.80~alpha-12.80~rc-12.80.0-1build1
 None known
glib-networking
Ubuntu:26.10
 All versions, plus listed versions
2.80.1-1build22.90.0-2
 None known
glib-networking
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.80.1-1build12.80.1-1build2
 None known
glib-networking
openSUSE:Tumbleweed
From an advisory covering 7 CVEs
 before 2.90.1-1.1
2.90.1-1.1

History

History
RecordedChangedSources
affected, factsOSV
affected, factsCVE List, EUVD, NVD, OSV
factsCVE List
affected, aliases, references
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-103963 is a high vulnerability (CVSS 7.5) in Red Hat Enterprise Linux 10, published October 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 27th percentile. Fixed in glib-networking 2.78.0-3.

References

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