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CVE-2026-103963: Denial of Service Risk in glib-networking

CVE-2026-103963: Denial of Service Risk in glib-networking

First seen 30 Oct 2026, 16:18 UTC • •
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ThreatCluster AI
ThreatCluster •October 30, 2026 at 17:14 UTC
  • •CVE-2026-103963 allows DoS via unbounded memory growth in glib-networking.
  • •Affected systems include GLib-based applications using TLS 1.3.
  • •Mitigation options are limited; users should apply vendor patches immediately.

A flaw identified as CVE-2026-103963 affects glib-networking, where the client-side session cache for TLS 1.3 does not limit session tickets for a single host. This vulnerability allows a malicious server to send excessive session ticket messages, leading to unbounded memory consumption and potential Denial of Service (DoS). Affected systems include GLib-based desktop applications and services making outbound TLS connections. Exploitation is assessed as low complexity, with no confirmed reported. The risk is categorized as high due to the potential for service disruption. Mitigation options are limited, with no suitable workarounds available. Users are advised to monitor memory usage and apply vendor patches promptly.

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Timeline

2026-10-30
CVE-2026-103963 published
A vulnerability in glib-networking was disclosed, allowing potential DoS via excessive TLS session tickets.
Redpacketsecurity
2026-10-30
Red Hat advisory issued
Red Hat confirmed the flaw and noted that mitigation options are either unavailable or inadequate for widespread deployment.
access.redhat.com

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Common questions

What systems are vulnerable?
GLib-based desktop applications and services that establish TLS 1.3 connections are vulnerable.
Is there a patch available?
Yes, users are advised to apply the vendor's fixed package update promptly.
What should I monitor for signs of exploitation?
Monitor for unusual memory growth in GLib-using client processes during TLS connections.