CVE-2026-58010

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.

Any applications calling the g_variant_is_normal_form(), g_variant_get_normal_form() or g_variant_byteswap() functions that process untrusted GVariant data received from D-Bus, network or file are vulnerable to this issue. This flaw can cause an out-of-bounds read of only 1 byte, leading to an information disclosure of only 1 byte and a denial of service when the out-of-bounds read crosses a page boundary. 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.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.