CVE-2026-103963

Name	CVE-2026-103963
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).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
glib-networking (PTS)	bookworm	2.74.0-4	vulnerable
	trixie	2.80.1-1	vulnerable
	forky, sid	2.90.0-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
glib-networking	source	(unstable)	(unfixed)	unimportant

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2465656
https://gitlab.gnome.org/GNOME/glib-networking/-/work_items/234
https://gitlab.gnome.org/GNOME/glib-networking/-/merge_requests/288
Fixed by: https://gitlab.gnome.org/GNOME/glib-networking/-/commit/2df47856016fdd3ac7544cc7c899b22819c29c4e (2.90.1)
OpenSSL backend disabled by default upstream and in Debian