CVE-2025-4056 Glib: glib crash after long command line

What is CVE-2025-4056?

CVE-2025-4056 is a high-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 28 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw was found in GLib. A denial of service on Windows platforms may occur if an application attempts to spawn a program using long command lines.

Weakness: CWE-94

Which versions are affected by CVE-2025-4056?

It affects 1 product.

Products include Gnome Glib.

How do I fix CVE-2025-4056?

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-2025-4056 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-4056 exists.

Other vulnerabilities in Red Hat Enterprise Linux 10

• CVE-2020-35457 Integer overflow in n/a High 7.8
• CVE-2009-3289 Privilege escalation in n/a High 7.8
• CVE-2025-13601 Glib: integer overflow in in g_escape_uri_string() High 7.7
• CVE-2026-58016 Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml" High 7.5
• CVE-2019-13012 Misconfiguration in n/a High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-6gjq-8hm4-wjmq, JLSEC-2025-168, MINI-mcvj-9m67-gw3r, OESA-2025-1551.