CVE-2026-3389 Squirrel sqstdrex.cpp sqstd_rex_newnode null pointer dereference
A local attacker can cause a denial of service via null pointer dereference in the Squirrel scripting library's regex engine.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3389?
CVE-2026-3389 is a medium-severity vulnerability in Squirrel, published on 1 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was determined in Squirrel up to 3.2. This vulnerability affects the function sqstd_rex_newnode in the library sqstdlib/sqstdrex.cpp. Executing a manipulation can lead to null pointer dereference. The attack can only be executed locally. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-3389?
It affects 1 product.
Products include Squirrel-Lang Squirrel.
How do I fix CVE-2026-3389?
No fix has been published for CVE-2026-3389 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3389 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3389 exists.
Other vulnerabilities in Squirrel
Sources
Also known as DEBIAN-CVE-2026-3389, GHSA-g9mq-qjc2-8pgx, UBUNTU-CVE-2026-3389.