CVE-2025-62526 OpenWrt ubusd vulnerable to heap buffer overflow

High 7.9 Published 22 Oct 2025 Updated 22 Oct 2025

Heap buffer overflow in ubusd allows arbitrary code execution and ACL bypass before checks, affecting OpenWrt embedded devices.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2025-62526?

CVE-2025-62526 is a high-severity memory corruption vulnerability in Openwrt Openwrt, published on 22 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, ubusd contains a heap buffer overflow in the event registration parsing code. This allows an attacker to modify the head and potentially execute arbitrary code in the context of the ubus daemon. The affected code is executed before running the ACL checks, all ubus clients are able to send such messages. In addition to the heap corruption, the crafted subscription also results in a bypass of the listen ACL. This is fixed in OpenWrt 24.10.4. There are no workarounds.

Weakness: CWE-122

Which versions are affected by CVE-2025-62526?

It affects 1 product.

Products include Openwrt Openwrt.

How do I fix CVE-2025-62526?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-62526 being exploited?

There is no known exploitation of CVE-2025-62526 in the wild and no public exploit code.

All Openwrt Openwrt vulnerabilities

Sources

Also known as GHSA-cp32-65v4-cp73, ROOT-OS-UBUNTU-2204-CVE-2025-62526.