CVE-2026-1484 Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode()
An integer overflow in GLib's base64 encoder allows out-of-bounds writes, potentially leading to code execution or crashes when processing large inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-1484?
CVE-2026-1484 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-1484?
How do I fix CVE-2026-1484?
Apply the vendor's patch.
Is CVE-2026-1484 being exploited?
There is no known exploitation of CVE-2026-1484 in the wild and no public exploit code.
Sources
Also known as AZL-75467, AZL-75920, BELL-CVE-2026-1484, DEBIAN-CVE-2026-1484, ECHO-5566-e5f1-09d5, GHSA-r2rp-r5cj-6c6x and 1 more.