CVE-2023-32636 Denial of service in glib
Attackers can cause denial of service in glib via slow offset table validation in gvariant deserialization, affecting distributors who backported a specific fix.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-32636?
CVE-2023-32636 is a medium-severity denial of service vulnerability in glib, published on 14 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in glib, where the gvariant deserialization code is vulnerable to a denial of service introduced by additional input validation added to resolve CVE-2023-29499. The offset table validation may be very slow. This bug does not affect any released version of glib but does affect glib distributors who followed the guidance of glib developers to backport the initial fix for CVE-2023-29499.
Which versions are affected by CVE-2023-32636?
It affects 1 product.
Products include Gnome Glib.
How do I fix CVE-2023-32636?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-32636 being exploited?
There is no known exploitation of CVE-2023-32636 in the wild and no public exploit code.
Other vulnerabilities in glib
- CVE-2020-35457 Integer overflow in n/a
- CVE-2009-3289 Privilege escalation in n/a
- CVE-2025-13601 Glib: integer overflow in in g_escape_uri_string()
- CVE-2026-58016 Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml"
- CVE-2025-4056 Glib: glib crash after long command line
Sources
Also known as AZL-28778, GHSA-79g9-vx8c-xfmq, JLSEC-2025-162, UBUNTU-CVE-2023-32636.