CVE-2026-1489: Glib: glib: memory corruption via integer overflow in unicode case conversion
A flaw was found in GLib. An integer overflow vulnerability in its Unicode case conversion implementation can lead to memory corruption. By processing specially crafted and extremely large Unicode strings, an attacker could trigger an undersized memory allocation, resulting in out-of-bounds writes. This could cause applications utilizing GLib for string conversion to crash or become unstable.
Other sources
Integer Overflow vulnerability in GLib’s Unicode case conversion implementation. The flaw is caused by mixing signed and unsigned integer types when calculating output buffer lengths across outputmarks() and realtolower(). An integer overflow can result in an undersized heap allocation followed by out-of-bounds writes during UTF-8 character conversion. Exploitation requires an application to process attacker-controlled large Unicode input and may result in crashes or potential memory corruption.
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-1489?
CVE-2026-1489 is considered a high severity vulnerability due to the potential for memory corruption.
How do I fix CVE-2026-1489?
To fix CVE-2026-1489, you should update GLib to the latest version provided by your distribution or vendor.
What type of attack does CVE-2026-1489 enable?
CVE-2026-1489 enables attackers to cause memory corruption by exploiting integer overflow in Unicode case conversion.
Who is affected by CVE-2026-1489?
CVE-2026-1489 affects GLib users, particularly those processing large Unicode strings.
Can CVE-2026-1489 lead to system crashes?
Yes, CVE-2026-1489 can lead to system crashes due to memory corruption resulting from the vulnerability.