Squirrel up to 3.2 sqstdlib/sqstdrex.cpp sqstd_rex_newnode null pointer dereference

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.9	$0-$5k	0.55

Summaryinfo

A vulnerability marked as problematic has been reported in Squirrel up to 3.2. This issue affects the function sqstd_rex_newnode in the library sqstdlib/sqstdrex.cpp. The manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-3389. The attack can only be performed from a local environment. Furthermore, an exploit is available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Squirrel up to 3.2. This issue affects the function sqstd_rex_newnode in the library sqstdlib/sqstdrex.cpp. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-3389. The exploitation is known to be easy. Attacking locally is a requirement. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet. The vulnerability scanner Nessus provides a plugin with the ID 300841 (Linux Distros Unpatched Vulnerability : CVE-2026-3389), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (300841) and EUVD (EUVD-2026-9124). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Squirrel

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.9

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CNA Base Score: 3.3
CNA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 300841
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-3389

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/28/2026 Advisory disclosed
02/28/2026 +0 days VulDB entry created
03/05/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: 314
Status: Not defined

CVE: CVE-2026-3389 (🔒)
GCVE (CVE): GCVE-0-2026-3389
GCVE (VulDB): GCVE-100-348275
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/28/2026 15:58
Updated: 03/05/2026 22:59
Changes: 02/28/2026 15:58 (56), 03/01/2026 20:03 (30), 03/01/2026 21:10 (1), 03/04/2026 16:15 (1), 03/05/2026 03:02 (11), 03/05/2026 22:59 (2)
Complete: 🔍
Submitter: Oneafter
Cache ID: 216:D69:103

Submitinfo

Accepted

Submit #761315: albertodemichelis squirrel master-branch NULL Pointer Dereference (by Oneafter)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.