CVE-2020-36401 Use after free in n/a

High 7.8 Published 1 Jul 2021 Updated 4 Aug 2024

A double free vulnerability in mruby allows attackers to cause denial of service or potentially execute arbitrary code.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2020-36401?

CVE-2020-36401 is a high-severity use after free vulnerability in n/a, published on 1 Jul 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

mruby 2.1.2 has a double free in mrb_default_allocf (called from mrb_free and obj_free).

Weakness: CWE-415

Which versions are affected by CVE-2020-36401?

It affects 1 product.

Products include Mruby Mruby.

How do I fix CVE-2020-36401?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-36401 being exploited?

There is no known exploitation of CVE-2020-36401 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2020-36401, GHSA-qq64-7fh7-7hmw, UBUNTU-CVE-2020-36401.