Is CVE-2026-103963 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-103963?

CVE-2026-103963 has a CVSS v3 severity of HIGH (7.5).

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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).