CVE-2026-58010 Glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal()
An off-by-one error in GLib allows attackers to read one byte of memory and potentially cause a denial of service via crafted input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58010?
CVE-2026-58010 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 30 Jun 2026. 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. An off-by-one error can occur in the gvs_tuple_is_normal function in the glib/gvariant-serialiser.c file when doing an alignment padding check because the bounds check uses > instead of >=, causing an out-of-bounds read of only 1 byte. This issue can cause a minor information disclosure of 1 byte and a denial of service when the out-of-bounds read crosses a page boundary.
Weakness: CWE-126
Which versions are affected by CVE-2026-58010?
It affects 2 products.
Products include Gnome Glib, Redhat Enterprise Linux.
How do I fix CVE-2026-58010?
Apply the vendor's patch.
Is CVE-2026-58010 being exploited?
There is no known exploitation of CVE-2026-58010 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- 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-91427, BELL-CVE-2026-58010, DEBIAN-CVE-2026-58010, ECHO-7e1f-4e2c-02b1, GHSA-m7rp-473c-296x, JLSEC-2026-1243 and 5 more.