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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.2 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.8 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glib-networking | No fix yet | — |
| Debian 13 | glib-networking | No fix yet | — |
| Debian 12 | glib-networking | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | glib-networking | No fix yet | — |
| Ubuntu 26.04 LTS | glib-networking | No fix yet | — |
| Ubuntu 24.04 LTS | glib-networking | No fix yet | — |
| Ubuntu 22.04 LTS | glib-networking | No fix yet | — |
| Ubuntu 20.04 LTS | glib-networking | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | glib-networking | No fix yet | — |
| Ubuntu 16.04 LTS | glib-networking | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | glib-networking | 2.80.0-3.el10_3.4 | RHSA-2026:99696 |
| RHEL 9 | glib-networking | 2.68.3-3.el9_9.1 | RHSA-2026:99695 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.2 EUS | glib-networking | 2.80.0-3.el10_2.4 | RHSA-2026:99698 |
| RHEL 9.8 EUS | glib-networking | 2.68.3-3.el9_8.1 | RHSA-2026:99697 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | glib-networking | 2.80.0-3.el10_3.4 | RLSA-2026:99696 |
| Rocky Linux 9 | glib-networking | 2.68.3-3.el9_9.1 | RLSA-2026:99695 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glib-networking | 2.90.1-1.1 | openSUSE-SU-2026:12363-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | glib-networking +1 | 2.80.0-187.amzn2023.0.2 | ALAS2023-2026-3417 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | glib-networking | 2.78.0-3 | — |
Advisories 9
- RHSA-2026:99698 Red Hat Security Advisory: glib-networking security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99695 Red Hat Security Advisory: glib-networking security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99696 Red Hat Security Advisory: glib-networking security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:99697 Red Hat Security Advisory: glib-networking security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:99696 Important: glib-networking security update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:99695 Important: glib-networking security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4549 Red Hat Enterprise Linux (crun, xfsprogs, glib-networking): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ALAS2023-2026-3417 Important: glib-networking security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 9, 2026
- openSUSE-SU-2026:12363-1 glib-networking-2.90.1-1.1 on GA media SUSE / openSUSE Security Updates · Oct 31, 2026
References
- RHSA-2026:99695 vendor-advisory
- RHSA-2026:99696 vendor-advisory
- RHSA-2026:99697 vendor-advisory
- RHSA-2026:99698 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-103963 vdb-entry
- RHBZ#2465656 issue-tracking
- https://gitlab.gnome.org/GNOME/glib-networking/-/merge_requests/288