High 7.5Published Oct 30, 2026

CVE-2026-103963Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows remote denial of service

Updated under an hour ago (Oct 30, 2026, 2:30 AM ET)

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It affects Red Hat Enterprise Linux 10. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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).

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Oct 30, 2026
First seen by InfoSec Signals: Oct 30, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record

References

References

https://access.redhat.com/security/cve/CVE-2026-103963	vdb-entry, x-refsource-redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2465656	issue-tracking, x-refsource-redhat
https://gitlab.gnome.org/GNOME/glib-networking/-/merge_requests/288

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.