CVE-2025-6052: Glib: integer overflow in g_string_maybe_expand() leading to potential buffer overflow in glib gstring
A flaw was found in how GLib’s GString manages memory when adding data to strings. If a string is already very large, combining it with more input can cause a hidden overflow in the size calculation. This makes the system think it has enough memory when it doesn’t. As a result, data may be written past the end of the allocated memory, leading to crashes or memory corruption.
Other sources
An integer overflow vulnerability exists in the gstringmaybeexpand() function of the GLib library. When extremely large strings are used and more data is appended, an internal size calculation can wrap around, making the system incorrectly assume that there’s enough space in the buffer. This leads to a buffer overflow, causing memory corruption or a crash. Although difficult to exploit in practice due to the extremely large memory conditions required, this issue could be triggered remotely if an application accepts large untrusted input and uses GString for string operations.
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-6052?
CVE-2025-6052 has been classified with a high severity rating due to the potential for memory overflow issues.
How do I fix CVE-2025-6052?
To fix CVE-2025-6052, apply the latest security patches provided by the software vendor for GLib.
What are the potential impacts of CVE-2025-6052?
The potential impacts of CVE-2025-6052 include application crashes, data corruption, and possible remote code execution.
Which versions of GLib are affected by CVE-2025-6052?
CVE-2025-6052 affects multiple versions of GLib, specifically those that have not implemented the necessary memory management safeguards.
Can CVE-2025-6052 be exploited remotely?
Yes, CVE-2025-6052 can potentially be exploited remotely in applications that process untrusted input.