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.

• glib2.0 2.88.1-2 [trixie] - glib2.0 (Minor issue) [bookworm] - glib2.0 (Minor issue; GVariant deserialiser 1-byte over-read, reachability-gated) [bullseye] - glib2.0 (Minor issue; GVariant deserialiser 1-byte over-read, reachability-gated) https://gitlab.gnome.org/GNOME/glib/-/work_items/3915 https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5129 (2.89.0) https://gitlab.gnome.org/GNOME/glib/-/commit/8338414f6560216efe67d3cbf549e32f8630252a (2.89.0) https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5134 (2.88.1) https://gitlab.gnome.org/GNOME/glib/-/merge_requests/5135 (2.86.5)