Memory Consumption Vulnerability in glib-networking by Red Hat
CVE-2026-103963

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
30 October 2026

What is CVE-2026-103963?

A memory consumption vulnerability exists in glib-networking when using Transport Layer Security (TLS) version 1.3. The client-side session cache does not limit the number of session tickets for a single host. An attacker can exploit this flaw by sending a large number of session ticket messages, leading to unbounded memory growth in the client application. As a result, this behavior can exhaust the system memory, ultimately resulting in Denial of Service (DoS) conditions that disrupt normal application functionality.

References

https://access.redhat.com/security/cve/CVE-2026-103963
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2465656
issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/glib-networking/-/merge_re...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Found by AISLE in partnership with Red Hat.
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