CVE-2026-1484 — Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode()

Affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Siemens RUGGEDCOM RST2428P

A flaw was found in the GLib Base64 encoding routine when processing very large input data. Due to incorrect use of integer types during length calculation, the library may miscalculate buffer boundaries. This can cause memory writes outside the allocated buffer. Applications that process untrusted or extremely large Base64 input using GLib may crash or behave unpredictably.

USN-8017-1 — glib2.0 vulnerabilities

Affected: Ubuntu:22.04:LTS: glib2.0, Ubuntu:24.04:LTS: glib2.0, Ubuntu:25.10: glib2.0

It was discovered that GLib incorrectly parsed large Base64 data. An attacker could use this issue to cause GLib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-1484)

It was discovered that GLib incorrectly parsed certain treemagic files. An attacker could use this issue to cause GLib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-1485)

It was discovered that GLib incorrectly handled Unicode case conversion. An attacker could use this issue to cause GLib to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-1489)

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CVE-2026-1484 — Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode()

USN-8017-1 — glib2.0 vulnerabilities