CVE-2026-58016

An issue was discovered in GNOME GLib before 2.78.5, and 2.79.x and 2.80.x before 2.80.1, where a GDBus-based client subscribing to signals from a trusted system service on a shared computer can receive spoofed D-Bus signals from other users of the same computer.

In GNOME GLib before 2.82.1, the file gio/gsocks4aproxy.c has an off-by-one error leading to a buffer overflow because SOCKS4_CONN_MSG_LEN is insufficient for a trailing null character.

Denial of Service and resource exhaustion vulnerability in the GDBus component of GLib. The gdbusauth authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated attacker can send excessively long data streams, causing massive memory and CPU consumption, potentially leading to a crash or system hang.

In GLib, the D-Bus client-side implementation of the DBUS_COOKIE_SHA1 SASL authentication mechanism does not validate the cookie_context parameter received from the server. A malicious D-Bus server can supply a cookie_context containing path traversal sequences, causing the client to read an arbitrary file and exfiltrate sensitive data.

An off-by-one error was found in GLib's g_key_file_get_locale_string_list function in gkeyfile.c when loading a key file with an empty value. This flaw can cause an out-of-bounds access of 1 byte or a denial of service when the out-of-bounds access crosses a page boundary.

A flaw was found in GLib where a buffer over-read occurs in g_io_channel_read_line_backend() in giochannel.c when a custom line terminator longer than one byte is set, causing memcmp to read past the GString buffer. This vulnerability can lead to minor information disclosure of 7 bytes or denial of service if the over-read crosses a page boundary.

A flaw was found in GLib where a buffer over-read occurs in the g_regex_replace function when using the G_REGEX_RAW compile flag and case-change replacement escapes. 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 can lead to minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.

A flaw was found in GLib where an out-of-bounds read of 2 bytes occurs in the g_date_time_get_ymd function in glib/gdatetime.c when processing an invalid GDateTime object created by g_date_time_add_full. This can corrupt date output and cause logic errors.

An off-by-one error was found in GLib in the gvs_tuple_is_normal function within glib/gvariant-serialiser.c. The bounds check uses > instead of >=, causing an out-of-bounds read of one byte during alignment padding checks. This flaw can lead to minor information disclosure of one byte and denial of service if the read crosses a page boundary.

A flaw in glib allows a heap buffer overflow and denial-of-service (DoS) via an integer overflow in the GIO escape_byte_string() function when processing malicious file or remote filesystem attribute values.