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CVE-2026-103963high7.5

Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows remote denial of service

Impact

A flaw in glib-networking allows a malicious server to cause unbounded memory growth in the client application, potentially leading to a Denial of Service (DoS). The issue affects Red Hat Enterprise Linux 10 and 9. A malicious server can exploit this by sending excessive session ticket messages.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

redhat guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat Enterprise Linux 10

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat

Red Hat Enterprise Linux 6

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redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat

Red Hat Enterprise Linux 7

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redhat version evidence

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat

Red Hat Enterprise Linux 8

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redhat version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

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redhat version evidence

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affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:9

Original source 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).

Inside the record

Evidence available

Package identity · not supplied
Version evidence · not supplied
Remediation guidance
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-103963

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-400 ↗

Uncontrolled Resource Consumption

redhat

Related →
Contributing organizations · 1
redhat

Assigning organization

2026-10-30

What changed

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References

3 sources
access.redhat.com/security/cve/CVE-2026-103963
vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi
issue-trackingredhat
gitlab.gnome.org/GNOME/glib-networking/-/merge_requests/288
Source referenceredhat