Medium [CVE-2026-58011] out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid gdatetime

A flaw was found in GLib. An out-of-bounds read of only 2 bytes can occur in the g_date_time_get_ymd function in the glib/gdatetime.c file when an invalid GDateTime object produced by the g_date_time_add_full function is processed.

This flaw can corrupt the date output and potentially cause logic errors that may lead to a denial of service. Any applications that allow a user to submit a date to `g_date_time_add_full()` and later call any getter functions, such as `g_date_time_get_month()` or `g_date_time_get_year()`, with the returned GDateTime object are vulnerable to this issue.

This flaw can cause an out-of-bounds read of only 2 bytes, leading to a denial of service due to logic errors that a corrupted date can trigger. Due to these reasons, this vulnerability has been rated with a moderate severity.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L). Weakness: CWE-125.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 19 more.