CVE-2026-58010: Gnome Glib

High severity, CVSS 8.2. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Gnome Glib: before 2.86.5 (fixed in 2.86.5); version 2.88.0 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only

Published 2026-06-30. Last modified 2026-10-06.