RHSA-2026:99695 - Security Advisory

Topic

An update for glib-networking is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The glib-networking packages provide modules that extend the networking support in Glib. In particular, the packages contain a libproxy-based implementation of the GProxyResolver class type and a gnutls-based implementation of the GTlsConnection class type.

Security Fix(es):

• glib-networking: Unbounded TLS 1.3 session ticket queue growth in glib-networking allows remote denial of service (CVE-2026-103963)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

• BZ - 2465656 - CVE-2026-103963 glib-networking: Unbounded TLS 1.3 session ticket queue growth in glib-networking allows remote denial of service

CVEs

• CVE-2026-103963

References

• https://access.redhat.com/security/updates/classification/#important