CVE-2026-58011

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.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, in applications processing user-supplied dates, implement input validation to ensure the supplied date is within the supported range before calling g_date_time_add_full() with untrusted data, specifically rejecting inputs that result in a negative or zero days field.