Vulnerability · Published Mar 1, 2026 · Assigned by VulDB

CVE-2026-3389Squirrel sqstdrex.cpp sqstd_rex_newnode null pointer dereference

Low 3.3

In plain English

A low-severity null pointer dereference in Squirrel. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.2%top 91.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	squirrel3	no fix listed	DEBIAN-CVE-2026-3389
Ubuntu:22.04:LTS	squirrel3	no fix listed	UBUNTU-CVE-2026-3389
Ubuntu:25.10	squirrel3	no fix listed	UBUNTU-CVE-2026-3389
Ubuntu:26.04:LTS	squirrel3	no fix listed	UBUNTU-CVE-2026-3389
Ubuntu:26.10	squirrel3	no fix listed	UBUNTU-CVE-2026-3389

Affected products (as reported)

Vendor	Product	Versions
n/a	Squirrel	3.03.13.2

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References

VDB-348275 | Squirrel sqstdrex.cpp sqstd_rex_newnode null pointer dereference vdb-entry, technical-description
VDB-348275 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #761315 | albertodemichelis squirrel master-branch NULL Pointer Dereference third-party-advisory
https://github.com/albertodemichelis/squirrel/issues/314 issue-tracking
https://github.com/oneafter/0122/blob/main/i314/repro exploit