CVE-2025-4373: GNOME GLib integer overflow in g_string_insert_unichar

CVE-2025-4373 · Severity: medium · CVSS 4.8 · Published 2025-05-06

A security flaw was found in GLib, a fundamental software library used by many Linux applications and the GNOME desktop environment. An attacker could potentially cause an application to crash or behave unexpectedly by providing specially crafted input that triggers an internal calculation error. While difficult to exploit, this could impact the reliability and integrity of systems running affected software.

Technologies: Gnome Glib. Vendors: Gnome.

Quick answers

Is CVE-2025-4373 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-4373 being exploited in the wild.
How severe is CVE-2025-4373?
Medium severity, with a CVSS score of 4.8, published 6 May 2025.
Which products and versions are affected?
Gnome Glib through 2.80.4.
Is there a fix for CVE-2025-4373?
A patch was published on 2025-07-14: Red Hat released updates for RHEL 10 (RHSA-2025:10855) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-4373 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2025-4373?
Check whether you run Gnome Glib at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow vulnerability exists in GLib's g_string_insert_unichar() function within glib/gstring.c. When a caller provides a very large value for the insertion position, the internal offset calculation overflows, resulting in a buffer underwrite (CWE-124). This is reachable if an application passes untrusted or insufficiently validated integer input to this function. An attacker could potentially achieve a denial of service or limited memory corruption. Red Hat has released patches for Enterprise Linux 9 and 10 to address this issue.

Affected products

  • GNOME GLib through 2.80.4
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 10

Timeline

  • 2025-05-06: disclosed: CVE published by Red Hat
  • 2025-07-14: patched: Red Hat released updates for RHEL 10 (RHSA-2025:10855)
  • 2025-07-15: patched: Red Hat released updates for RHEL 9 (RHSA-2025:11140)

References

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