Quick answers
- Is CVE-2026-103963 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103963 being exploited in the wild.
- How severe is CVE-2026-103963?
- High severity, with a CVSS score of 7.5, published 30 October 2026.
- Which products and versions are affected?
- Gnome Glib-Networking <UNKNOWN>.
- Is there a fix for CVE-2026-103963?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-103963 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-103963?
- Check whether you run Gnome Glib-Networking at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an uncontrolled resource consumption flaw (CWE-400) in the TLS 1.3 session ticket handling code. The client-side session cache fails to enforce limits on the number of session tickets retained per host, allowing a remote attacker to send excessive tickets and trigger unbounded memory allocation. Attack requires no authentication or user interaction, only a network connection to a malicious TLS server.
Affected products
- GNOME glib-networking <UNKNOWN>
Timeline
- 2026-10-30: disclosed