CVE-2025-6052: Glib: integer overflow in g_string_maybe_expand() leading to potential buffer overflow in glib gstring

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-13 · updated 2026-06-17
Weakness: CWE-190

Description

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.

Affected products

GNOME GLib: from 2.75.3 through 2.84.3

References

https://access.redhat.com/security/cve/CVE-2025-6052
https://bugzilla.redhat.com/show_bug.cgi?id=2372666
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
https://cert-portal.siemens.com/productcert/html/ssa-253495.html

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