A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the `G_REGEX_RAW` compile flag and case-change replacement escapes because the string_append function processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CWE-126

https://access.redhat.com/security/cve/CVE-2026-58012

https://bugzilla.redhat.com/show_bug.cgi?id=2492247

https://gitlab.gnome.org/GNOME/glib/-/issues/3918

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